Section 22.07G - Per- and Polyfluoroalkyl Substances (PFAS) Monitoring and Analytical Requirements(1)General Applicability. Every Supplier of Water operating a Community Water System or Non-transient, Non-community Water System shall be subject to 310 CMR 22.07G(3) through (17).(2)Special Applicability for Transient, Non-community Water Systems. Every Supplier of Water operating a Transient, Non-community Water System shall collect, analyze and report the results of one sample from each Sampling Point, or alternate sampling location required by the Department pursuant to 310 CMR 22.07G(4)(a) or (b), no later than September 30, 2022. All such monitoring shall be performed in compliance with the provisions addressing monitoring protocols, invalidation of PFAS samples, PFAS analytical requirements, PFAS reporting requirements, PFAS6 minimum reporting levels and electronic filing requirement set forth in 310 CMR 22.07G(4), (9), (12), (13), (16) and (17).(3)Per- and Polyfluoroalkyl Substances. (a)PFAS. PFAS shall mean per- and polyfluoroalkyl substances.(b)PFAS Detection. PFAS Detection shall mean a concentration of any PFAS measured in accordance with 310 CMR 22.07G(12) which is greater than or equal to the analytical laboratory's applicable Minimum Reporting Level (or MRL).(c)PFAS6. PFAS6 shall mean the sum of the concentrations of the six contaminants listed in the following table: CAS No. | Contaminant |
1763-23-1 | Perfluorooctane Sulfonic Acid (PFOS) |
335-67-1 | Perfluorooctanoic Acid (PFOA) |
355-46-4 | Perfluorohexane Sulfonic Acid (PFHxS) |
375-95-1 | Perfluorononanoic Acid (PFNA) |
375-85-9 | Perfluoroheptanoic Acid (PFHpA) |
335-76-2 | Perfluorodecanoic Acid (PFDA) |
(d)PFAS6 Maximum Contaminant Level. The PFAS6 Maximum Contaminant Level (MCL) shall be 0.000020 milligrams per liter (mg/l) or 20 nanograms per liter (ng/l).(e)Review of PFAS and Drinking Water. Not later than December 31, 2023, and once every three years thereafter, the Department shall perform a review of relevant developments in the science, assessment and regulation of PFAS in drinking water for the purpose of evaluating whether to amend 310 CMR 22.07G(3) in light of any advancements in analytical or treatment technology, toxicology and/or any other relevant information. Information about this review shall be made available to the public.(4)Monitoring Protocols. For the purpose of determining compliance with the PFAS6 MCL set forth in 310 CMR 22.07G(3)(d), monitoring shall be conducted as follows:(a)Single Source Entry Points. Each Public Water System that draws water from a single source shall take a minimum of one sample at every entry point to the Distribution System which is representative of each of its sources after treatment (Sampling Point). Each sample shall be taken at the same Sampling Point, unless the Department determines, based upon local conditions (e.g., facility design), that an alternate sampling location(s) would be more representative of each source or treatment plant.(b)Multiple Source Entry Points. Any Public Water System that draws water from more than one source, where the sources are combined before distribution, shall sample at every entry point to the Distribution System which is representative of all such combined sources after treatment (Sampling Point) during periods of normal operating conditions (i.e., when water representative of all sources is being used). If all sources are not operated simultaneously under normal operating conditions, then additional samples shall be collected representing each source that is operated alone and/or each combination of sources that are operated together. Each sample shall be taken at the same Sampling Point unless the Department determines, based upon local conditions (e.g., facility design), that an alternate sampling location(s) would be more representative of each source or treatment plant.(c)Consecutive Systems. Unless required by the Department to evaluate PFAS levels, each Consecutive Public Water System shall be exempt from conducting compliance monitoring for PFAS under 310 CMR 22.07G for its purchased portion of water, provided that the Public Water System from which the water is obtained has conducted the monitoring required under 310 CMR 22.07G.(5)Initial Monitoring.(a)Applicability. 310 CMR 22.07G(5) shall apply to each Sampling Point, or alternate sampling location required by the Department pursuant to 310 CMR 22.07G(4)(a) or (b), where: 1. there have been no PFAS Detections;2. there has been a PFAS Detection, but the average of the PFAS6 in such detection and of PFAS6 in an associated Confirmatory Sample is less than or equal to 0.000010 mg/l; or3. subsequent to a PFAS Detection described in 310 CMR 22.07G(5)(a)2., there have been no PFAS Detection(s) where PFAS6 as determined for such detections is greater than 0.000010 mg/l.(b)Frequency and Timing. 1. Except as provided in 310 CMR 22.07G(5)(b)2. or 3., for each such location required to be sampled pursuant to 310 CMR 22.07G(5), four consecutive quarterly samples shall be collected and each such sample shall be analyzed for PFAS in accordance with 310 CMR 22.07G(12). Each sample shall be collected the first month of every quarter during initial monitoring. A Supplier of Water serving the specified population shall commence initial monitoring on the date set forth in 310 CMR 22.07G(5)(b)1.a. through c.: a. greater than 50,000 individuals, January 1, 2021;b. 50,000 individuals or fewer, but greater than 10,000 individuals, April 1, 2021; orc. 10,000 or fewer individuals, October 1, 2021.2. If a Supplier of Water meets any of the following conditions after the applicable commencement date described in 310 CMR 22.07G(5)(b)1., it shall commence initial monitoring of such locations within the first full calendar quarter of delivering water to the public: a. begins operation of a new Public Water System; orb. puts a New Source on-line.3. If a Supplier of Water reactivates an existing source or opens a Seasonal System after the applicable commencement date described in 310 CMR 22.07G(5)(b)1., it shall commence initial monitoring of such locations within the first month of delivering water to the public.(c)Waivers. Any Public Water System subject to 310 CMR 22.07G(5), all of whose analytical results for the first two quarters of monitoring described in 310 CMR 22.07G(5)(b) are below the applicable MRLs, may submit a written request to waive the third and fourth quarters of such monitoring, subject to the Department's written approval based upon a determination that there is no known or suspected PFAS contamination in the vicinity of the Public Water System or its sources of water.(6)Routine Monitoring.(a)Applicability. 310 CMR 22.07G(6) shall apply to any Sampling Point, or alternate sampling location required by the Department pursuant to 310 CMR 22.07G(4)(a) or (b), at which there are no PFAS Detections during initial monitoring or during three years of annual monitoring.(b)Monthly Monitoring.1. Except as provided in 310 CMR 22.07G(8)(b)2., a Supplier of Water shall monitor such locations on a monthly basis to determine compliance with the PFAS6 MCL as per 310 CMR 22.07G(10), if: a. there has been a PFAS Detection and the average of PFAS6 in such detection and of PFAS6 in an associated Confirmatory Sample is greater than 0.000010 mg/l; orb. the Department determines in writing that a location subject to quarterly or annual monitoring is no longer Reliably and Consistently Below the MCL.2. After completing the first quarter of monthly monitoring pursuant to 310 CMR 22.07G(8)(b)1., a Supplier of Water who is in violation of the PFAS6 MCL, determined as per 310 CMR 22.07G(10), may request written approval from the Department to use the results from a single sample taken in the first month of each subsequent quarter to determine compliance with the PFAS6 MCL rather than using the average of the three monthly samples otherwise required, subject to the following: a. upon such written approval, if any such single sample alone exceeds the PFAS6 MCL, such Supplier of Water shall be in violation of the PFAS6 MCL immediately and shall provide public notice in accordance with 310 CMR 22.16; andb. if any such single sample is less than or equal to the PFAS6 MCL, then such Supplier of Water shall continue monthly monitoring during the remaining two months of the quarter and compliance with the PFAS6 MCL shall be determined as per 310 CMR 22.07G(10).(c)Quarterly Monitoring. If any such location has had PFAS treatment installed and the Department determines in writing that such location is Reliably and Consistently Below the MCL, then the Supplier of Water shall monitor that location in the first month of each quarter.(d)Annual Monitoring. A Supplier of Water shall monitor such locations on an annual basis during the first month of the calendar quarter that previously yielded the highest analytical result. A Supplier of Water shall conduct this annual monitoring if: 1. all of the following are true: a. all four quarters of initial monitoring pursuant to 310 CMR 22.07G(5)(a) have been completed;b. the first PFAS Detection occurred during such initial monitoring and the average of PFAS6 in such detection and of PFAS6 in an associated Confirmatory Sample is less than or equal to 0.000010 mg/l; andc. for any second or later PFAS Detection occurring during such initial monitoring with PFAS6 greater than 0.000010 mg/l, the average of PFAS6 in such second or later detection and of PFAS6 in the Confirmatory Sample associated with each such detection is less than or equal to 0.000010 mg/l;2. the Department determines in writing that a location subject to monthly monitoring under 310 CMR 22.07G(8)(b), without the installation of PFAS treatment, is Reliably and Consistently Below the MCL;3. the Department determines in writing that a location subject to quarterly monitoring under 310 CMR 22.07G(8)(c), taking into consideration any documentation provided by such Supplier of Water and any other relevant factors, would be Reliably and Consistently Below the MCL without PFAS treatment; or4. a location subject to routine monitoring under 310 CMR 22.07G(6): a. has its first PFAS Detection and the average of PFAS6 in such detection and of PFAS6 in an associated Confirmatory Sample is less than or equal to 0.000010 mg/l; orb. has a second or later PFAS Detection with a PFAS6 less than or equal to 0.000010 mg/l and the Department determines in writing that such location is not Reliably and Consistently Below the MCL.(7)PFAS Detections. (a)Applicability. 310 CMR 22.07G(7) shall apply to any Sampling Point, or alternate sampling location required by the Department pursuant to 310 CMR 22.07G(4)(a) or (b), following: 1. the first PFAS Detection during either initial or routine monitoring;2. the second or later PFAS Detection during initial monitoring where PFAS6 as determined for such second or later detection is greater than 0.000010 mg/l;3. the second or later PFAS Detection during routine monitoring where PFAS6 as determined for such second or later detection is greater than 0.000010 mg/l, unless the Department determines in writing that such location is Reliably and Consistently Below the MCL; or4. the receipt by the Department of an analytical result during quarterly or annual monitoring which the Department determines is outside the historic range of PFAS results.(b)Reporting. Any PFAS Detection described in 310 CMR 22.07G(7)(a)1., 2., or 3. shall be reported to the Department within seven days of receipt of such result from the laboratory.(c)Confirmatory Sampling. The Supplier of Water shall obtain a Confirmatory Sample for any analytical result described in 310 CMR 22.07G(7)(a), as soon as possible after receipt of such result from the laboratory or notification from the Department, as applicable, and no later than two weeks from such date. Provided, however, a Supplier of Water may request a one-time extension not to exceed two weeks for obtaining such Confirmatory Sample, using a form specified by the Department, upon a demonstration of need due to circumstances beyond its control (e.g., system design, etc.) to the satisfaction of and at the sole discretion of the Department.(d)Source Sampling. If a PFAS Detection described in 310 CMR 22.07G(7)(a)1., 2. or 3. represents multiple sources, then samples representing the individual source water shall also be collected and analyzed for PFAS.(e)Public Education. Any Supplier of Water subject to 310 CMR 22.07G(7), where there has been a PFAS Detection and the average of such detection and an associated Confirmatory Sample exceeds the PFAS6 MCL, shall provide public education materials regarding the exceedance in accordance with the following requirements: 1. notice of the exceedance shall be provided using materials approved by the Department;2. such materials shall be provided to all persons served by the affected Public Water System, including without limitation consumers who do not receive water bills;3. such materials shall be provided as soon as practical and no later than 30 days after receipt of Confirmatory Sample results from the laboratory;4. in any community where such Supplier of Water's consumers include: a. either: i. 10% or more non-English speaking residents who speak a common language; orii. more than 1000 non-English speaking residents who speak a common language, such materials must contain information in the language(s) appropriate for each such group of residents regarding the importance of the notice.b. 25% or more non-English speaking residents who speak a common language, such materials must contain a statement in the appropriate language(s) for each such group of residents which includes a telephone number or address where those residents may contact the affected Public Water System to obtain a translated copy of the materials or assistance in the appropriate language(s).5. such materials shall be provided by mail and/or other method approved by the Department (e.g., a Non-transient Non-community Water System may be permitted to post the materials in one or more conspicuous locations in the facility for a minimum number of days);6. such materials shall include all results from both the PFAS Detection and the Confirmatory Sample; the average PFAS6 concentration of the samples; the PFAS6 MCL as provided in 310 CMR 22.07G(3)(d) and the definition of MCL as provided in 310 CMR 22.02(1); an explanation of the health effects of PFAS6; steps consumers can take to reduce exposure to PFAS in drinking water; and contact information for the Supplier of Water;7. until either the Public Water System obtains a monitoring result at or below the PFAS6 MCL at such locations as described in 310 CMR 22.07G(7)(a) or the Supplier of Water takes the contaminated source(s) off-line: a. if such materials were mailed, updated materials shall be re-mailed quarterly;b. if such materials were posted, for an approved minimum number of days, updated materials shall be re-posted quarterly for the same minimum number of days;c. if such materials were published in a local newspaper, updated materials shall be re-published quarterly; and/ord. if such materials were provided by other Department-approved methods, updated materials shall be provided quarterly by the same methods; and8. a copy of such materials shall be submitted to the Department upon initial and each subsequent issuance if required by 310 CMR 22.07G(7)(e)7. along with a written certification by the Supplier of Water that the materials have been distributed in compliance with 310 CMR 22.07G(7)(e)1. through 6.(8)Increased Monitoring Frequency Following PFAS Detection. (a)Applicability. 310 CMR 22.07G(8) shall apply to each Sampling Point, or alternate sampling location required by the Department pursuant to 310 CMR 22.07G(4)(a) or (b), at which there has been a PFAS Detection.(b)Monthly Monitoring.1. Except as provided in 310 CMR 22.07G(8)(b)2., a Supplier of Water shall monitor such locations on a monthly basis to determine compliance with the PFAS6 MCL as per 310 CMR 22.07G(10), if: a. there has been a PFAS Detection and the average of PFAS6 in such detection and of PFAS6 in an associated Confirmatory Sample is greater than 0.000010 mg/l; orb. the Department determines in writing that a location subject to quarterly or annual monitoring is no longer Reliably and Consistently Below the MCL.2. After completing the first quarter of monthly monitoring pursuant to 310 CMR 22.07G(8)(b)1., a Supplier of Water who is in violation of the PFAS6 MCL, determined as per 310 CMR 22.07G(10), may request written approval from the Department to use the results from a single sample taken in the first month of each subsequent quarter to determine compliance with the PFAS6 MCL rather than using the average of the three monthly samples otherwise required, subject to the following: a. upon such written approval, if any such single sample alone exceeds the PFAS6 MCL, such Supplier of Water shall be in violation of the PFAS6 MCL immediately and shall provide public notice in accordance with 310 CMR 22.16; andb. if any such single sample is less than or equal to the PFAS6 MCL, then such Supplier of Water shall continue monthly monitoring during the remaining two months of the quarter and compliance with the PFAS6 MCL shall be determined as per 310 CMR 22.07G(10).(c)Quarterly Monitoring. If any such location has had PFAS treatment installed and the Department determines in writing that such location is Reliably and Consistently Below the MCL, then the Supplier of Water shall monitor that location in the first month of each quarter.(d)Annual Monitoring. A Supplier of Water shall monitor such locations on an annual basis during the first month of the calendar quarter that previously yielded the highest analytical result. A Supplier of Water shall conduct this annual monitoring if: 1. all of the following are true: a. all four quarters of initial monitoring pursuant to 310 CMR 22.07G(5)(a) have been completed;b. the first PFAS Detection occurred during such initial monitoring and the average of PFAS6 in such detection and of PFAS6 in an associated Confirmatory Sample is less than or equal to 0.000010 mg/l; andc. for any second or later PFAS Detection occurring during such initial monitoring with PFAS6 greater than 0.000010 mg/l, the average of PFAS6 in such second or later detection and of PFAS6 in the Confirmatory Sample associated with each such detection is less than or equal to 0.000010 mg/l;2. the Department determines in writing that a location subject to monthly monitoring under 310 CMR 22.07G(8)(b), without the installation of PFAS treatment, is Reliably and Consistently Below the MCL;3. the Department determines in writing that a location subject to quarterly monitoring under 310 CMR 22.07G(8)(c), taking into consideration any documentation provided by such Supplier of Water and any other relevant factors, would be Reliably and Consistently Below the MCL without PFAS treatment; or4. a location subject to routine monitoring under 310 CMR 22.07G(6): a. has its first PFAS Detection and the average of PFAS6 in such detection and of PFAS6 in an associated Confirmatory Sample is less than or equal to 0.000010 mg/l; orb. has a second or later PFAS Detection with a PFAS6 less than or equal to 0.000010 mg/l and the Department determines in writing that such location is not Reliably and Consistently Below the MCL.(9)Invalidation of PFAS Samples. All PFAS results shall be subject to the Department's review and may be invalidated where the associated quality control information indicates a failure in sample collection, sample preparation or analytical measurement. Invalidated results shall not be used in determining compliance with the PFAS6 MCL established in 310 CMR 22.07G(3)(d). Unless waived in writing by the Department as unnecessary (e.g., based upon the frequency of ongoing monitoring), a Supplier of Water shall collect and analyze a replacement sample for each invalidated result of a PFAS listed in 310 CMR 22.07G(3)(c).(10)PFAS6 Compliance Calculations. Compliance with the PFAS6 MCL established in 310 CMR 22.07G(3)(d) shall be determined in accordance with the requirements set forth below. If any one sampling location is in violation, then the Public Water System shall be considered in violation. (a) For a Supplier of Water monitoring monthly, compliance shall be determined once per calendar quarter: 1. after completing a full quarter of monthly monitoring; and2. by calculating a quarterly average of that quarter's monthly compliance monitoring result(s) at each Sampling Point, or alternate sampling location required by the Department pursuant to 310 CMR 22.07G(4)(a) or (b), rounded to the same number of significant figures as the Maximum Contaminant Level.(b) The quarterly average calculation requirements are as follows: 1. If multiple compliance monitoring samples are collected in any given calendar month, then the results of those samples shall be averaged in order to establish a single representative contaminant concentration for that calendar month. (An initial sample and a Confirmatory Sample collected in the same month, shall be averaged both for the purpose of determining whether additional monthly samples would be required, and for the purpose of determining the representative contaminant concentration for the first month. An initial sample and a Confirmatory Sample collected in different months shall still be averaged for the purpose of determining whether additional monthly samples would be required, but shall not be averaged for the purpose of determining the representative contaminant concentration for the first month. Instead, because the Confirmatory Sample was collected in the second month, on the one hand if no other sample was collected in the second month, then it shall serve as the second month's representative contaminant concentration. But, on the other hand if a second sample was collected during the second month, then there would be two samples collected during the second month, namely the Confirmatory Sample (for the first month's initial sample) and the second month's sample, and they shall be averaged together to determine the second month's representative contaminant concentration.)2. If any Supplier of Water fails to collect the required number of samples, compliance shall be determined based on the total number of samples collected. (E.g., if no samples were collected in one month, then the quarterly average would be the sum of the representative contaminant concentrations from the other two months, divided by two.)3. If an analytical result is less than the MRL, then the quarterly average shall be calculated using zero as the concentration for that PFAS.(c) A Supplier of Water monitoring quarterly or less frequently who detects PFAS6 within its Public Water System shall not be in violation, except as provided in 310 CMR 22.07G(10)(d), until: 1. it has conducted monthly sampling pursuant to 310 CMR 22.07G(8)(b); and2. a calculation made in accordance with 310 CMR 22.07G(10)(a) and (b) would result in a violation.(d) If any sample result would cause the quarterly average to exceed the PFAS6 MCL at any Sampling Point, or alternate sampling location required by the Department pursuant to 310 CMR 22.07G(4)(a) or (b), then the Public Water System shall be in violation immediately and shall be subject to the requirements 310 CMR 22.07G(11).(11)When a Quarterly Average Exceeds the PFAS6 MCL. If a quarterly average calculated pursuant to 310 CMR 22.07G(10)(a) and (b) and rounded to the same number of significant figures as the Maximum Contaminant Level, exceeds the PFAS6 MCL, then the Supplier of Water shall: (a) report to the Department in accordance with 310 CMR 22.15,(b) provide public notice in accordance with 310 CMR 22.16, and(c) comply with the requirements of 310 CMR 22.03(14) and such other applicable provisions of 310 CMR 22.00, as specified by the Department.(12)PFAS Analytical Requirements.(a)Methods of Analysis. Analysis for PFAS listed in 310 CMR 22.07G(3)(c) shall be conducted using either of the following EPA methods: 1.Method 537 U.S. Environmental Protection Agency September 2009. Determination of Selected Perfluorinated Alkyl Acids in Drinking Water by Solid Phase Extraction and Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS). Ver. 1.1. EPA Document #: EPA/600/R-08/092; or2.Method 537.1 U.S. Environmental Protection Agency November 2018. Determination of Selected Per- and Polyfluorinated Alkyl Substances in Drinking Water by Solid Phase Extraction and Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS). Ver. 1.0. EPA Document #: EPA/600/R-18/352.(b)Scope of Analysis. All samples analyzed pursuant to 310 CMR 22.07G shall be analyzed for the full scope of PFAS covered by the method selected in 310 CMR 22.07G(12)(a). (13)PFAS Reporting Requirements. All analytical results, for all PFAS within the scope of the analytical method selected in 310 CMR 22.07G(12)(a), whether obtained pursuant to a requirement of 310 CMR 22.00 or on a voluntary basis, shall be reported to the Department in accordance with 310 CMR 22.15.(14)Use of Previously Collected PFAS Data. (a)Eligibility. A Supplier of Water, prior to the applicable commencement date of initial monitoring specified in 310 CMR 22.07G(5)(b)1., may request the Department's written approval to substitute monitoring data which was obtained during different calendar quarters and prior to such commencement date for up to an equivalent number of sequential quarters of initial monitoring otherwise required pursuant to 310 CMR 22.07G(5).(b)Basis of Approval. Such approval shall be based upon a determination as to whether the substitute monitoring data was collected and analyzed in a manner consistent with or otherwise equivalent to the requirements of 310 CMR 22.07G. A Supplier of Water shall notify the Department, prior to the commencement date of initial monitoring specified in 310 CMR 22.07G(5)(b)1., of its intention to substitute such approved monitoring data.(c)Requirements following Notification. Following the notification required by 310 CMR 22.07G(14)(b), such Supplier of Water shall be subject to the requirements of 310 CMR 22.07G, subject to any Department approved modification taking into account any actions the Supplier of Water has taken in response to such substitute monitoring data (e.g., public notification, installation of treatment, etc.), as if the analytical results for such approved monitoring data were received on the date of such notification.(15)Monitoring Schedules. A Supplier of Water shall monitor its Public Water System during each Compliance Period in accordance with the requirements 310 CMR 22.07G, unless otherwise directed in writing by the Department based on emergency considerations, laboratory capacity, and Public Water System operational considerations.(16)PFAS6 Minimum Reporting Levels. Laboratories conducting PFAS analysis for each contaminant listed at 310 CMR 22.07G(3)(c) shall be capable of obtaining individual MRLs less than or equal to 0.0000020 mg/l or 2.0 ng/l.(17)Electronic Filing Requirement. All analytical results required to be submitted to the Department pursuant to 310 CMR 22.07G shall be made by electronic submission, in accordance with 310 CMR 22.03(13).Adopted by Mass Register Issue 1419, eff. 6/12/2020.Amended by Mass Register Issue 1427, eff. 10/2/2020.Amended by Mass Register Issue 1430, eff. 10/2/2020.