Wash. Admin. Code § 246-292-040

Current through Register Vol. 24-23, December 1, 2024

Section 246-292-040 - Classification of public water systems

The department shall classify water treatment plants and distribution systems.

(1) Water treatment plants.

(a) Water treatment plants are classified according to the point system in the ABC "Purification Plant Criteria" publication (October 2007) and are in Table 1.

Table 1 Water Treatment Plant Classification

Total Points Assigned	Water Treatment Plant Classification
Less than 31	Class 1
31 to 55	Class 2
56 to 75	Class 3
More than 75	Class 4

(b) The scope of water treatment plant processes include, but are not limited to:

(i) Water filtration;

(ii) Ion exchange;

(iii) Electrodialysis;

(iv) Reverse osmosis; or

(v) Inorganic contaminant removal.

(c) The scope of a water treatment plant does not include unit processes installed for:

(i) In-line fluoridation;

(ii) In-line chlorination; or

(iii) Chemical addition to inhibit corrosion.

(2) Distribution systems are classified according to the population served from a public water system's WFI form and are in Table 2.

Table 2 Distribution Systems Classification

Population Served	Distribution System Classification
Less than 251	Class S
251 to 1,500	Class 1
1,501 to 15,000	Class 2
15,001 to 50,000	Class 3
More than 50,000	Class 4

Wash. Admin. Code § 246-292-040

Amended by WSR 14-01-003, filed 12/4/13, effective 1/4/2014

Statutory Authority: Chapter 70.119 RCW and Safe Drinking Water Act, Public Law 104-182; 64 F.R. 5916 - 5921. 01-02-070, § 246-292-040, filed 12/29/00, effective 1/29/01. Statutory Authority: Chapter 70.119 RCW. 94-04-004, § 246-292-040, filed 1/20/94, effective 2/20/94. Statutory Authority: RCW 43.70.040. 91-02-049 (Order 121), recodified as § 246-292-040, filed 12/27/90, effective 1/31/91. Statutory Authority: RCW 70.119.050. 78-10-053 (Order 1343), § 248-55-050, filed 9/22/78.