5 Colo. Code Regs. § 1002-33.5
All waters of Region 12 are subject to the following standard for temperature. (Discharges regulated by permits, which are within the permit limitations, shall not be subject to enforcement proceedings under this standard). Temperature shall maintain a normal pattern of diurnal and seasonal fluctuations with no abrupt changes and shall have no increase in temperature of a magnitude, rate, and duration deemed deleterious to the resident aquatic life. This standard shall not be interpreted or applied in a manner inconsistent with section 25-8-104, C.R.S.
See Basic Standards and Methodologies for Surface Water for a listing of organic standards at 31.11 Table B and metal standards found at 31.16 Table III. The column in the tables headed "Water Fish" are presumptively applied to all Aquatic Life class 1 streams and are applied to Aquatic Life class 2 streams on a case-by-case basis as shown in Appendix 33-1. The column in the tables at 31.11 headed "Fish Ingestion" is presumptively applied to all Aquatic Life class 1 streams which do not have a water supply classification, and are applied to Aquatic Life class 2 streams which do not have a water supply classification, on a case-by-case basis as shown in Appendix 33-1.
Prior to December 31, 2022 for chlorophyll a and prior to December 31, 2027 for total phosphorus, interim nutrient values will be considered for adoption only in the limited circumstances defined at 31.17(e) and (f). These circumstances include headwaters, Direct Use Water Supply (DUWS) Lakes and Reservoirs, and other special circumstances determined by the Commission. Additionally, prior to December 31, 2027, only total phosphorus and chlorophyll a will be considered for adoption. After December 31, 2027, total nitrogen will be considered for adoption per the circumstances outlined in 31.17(g).
Prior to December 31, 2027, nutrient criteria will be adopted for headwaters on a segment by segment basis for the Upper Colorado and North Platte River Basins. Moreover, pursuant to 31.17(e) nutrient standards will only be adopted for waters upstream of all permitted domestic wastewater treatment facilities discharging prior to May 31, 2012 or with preliminary effluent limits requested prior to May 31, 2012, and any non-domestic facilities subject to Regulation 85 effluent limits and discharging prior to May 31, 2012. The following is a list of all permitted domestic wastewater treatment facilities discharging prior to May 31, 2012 or with preliminary effluent limits requested prior to May 31, 2012, and any non-domestic facilities subject to Regulation 85 effluent limits and discharging prior to May 31, 2012 in the Upper Colorado and North Platte River Basins:
Segment | Permittee | Facility name | Permit No. |
COUCUC03 | Colorado Dept of Transportation | Grizzly Creek Res Area WWTF | COG588067 |
COUCUC03 | Rock Gardens MHP | Rock Gardens MHP & Campground | COG588083 |
COUCUC03 | Colorado Dept of Transportation | Hanging Lake Res Area WWTF | COG588076 |
COUCUC03 | Colorado Dept of Transportation | Bair Ranch Rest Area | COG588075 |
COUCUC03 | Hermes Group | Two Rivers Village Metro Dist WWTF | COG588070 |
COUCUC03 | Roundup River Ranch | Roundup River Ranch WWTF | COG588116 |
COUCUC03 | Hot Sulphur Springs Town of | Hot Sulphur Springs WWTF | COG588084 |
COUCUC03 | Allegient Management | Ouray Ranch Homeowners Assn WWTF | COG588041 |
COUCUC06a | C Lazy U Ranch Holdings LLC % Triton Investment Co | C Lazy U Ranch, INC. | COG588072 |
COUCUC06b | Three Lakes Water and Sanitation District | Willow Creek Lagoons | CO0037681 |
COUCUC07e | Kremmling Sanitation District | Kremmling Sanitation Dist WWTF | CO0048437 |
COUCUC10a | Winter Park Water and Sanitation District | Winter Park WSD WWTF | CO0026051 |
COUCUC10a | Young Life Campaign Inc | Crooked Creek Ranch | CO0045411 |
COUCUC10a | Colorado Mountain Resort Investors LLC | Devil's Thumb Ranch | CO0046566 |
COUCUC10a | Tabernash Meadows WSD | Tabernash Meadows WSD WWTF | CO0045501 |
COUCUC10c | Fraser Town of | Upper Fraser Valley TP | CO0040142 |
COUCUC10c | Granby Sanitation District | Granby Sanitation District | CO0020699 |
COUCBL02a | Upper Blue Sanitation Dist | Iowa Hill Water Reclamation | CO0045420 |
COUCBL08 | Dundee Realty USA LLC | Arapahoe Basin Ski Area | CO0023876 |
COUCBL13 | Copper Mountain Consolidated Metro Dist | Copper Mtn Cons Metro District | CO0021598 |
COUCBL17 | Silverthorne/Dillon Joint Sewer Authority | Blue River WWTF | CO0020826 |
COUCBL22 | Frisco Sanitation District | Frisco Sanitation District WWTF | CO0020451 |
COUCBL22 | Snake River WWTF | Summit County Snake River WWTP | CO0029955 |
COUCBL22 | Upper Blue Sanitation District | Farmers Korner WWTF | CO0021539 |
COUCEA02 | Red Cliff Town of | Red Cliff Town of WWTP | CO0021385 |
COUCEA08 | Eagle River WSD | Vail WWTF | CO0021369 |
COUCEA09a | Eagle River Water & Sanitation Dist | Avon WWTP | CO0024431 |
COUCEA09a | Eagle River Water & San Dist | Edwards WWTF | CO0037311 |
COUCEA09b | Eagle Town of | Eagle Town of WWTP | CO0048241 |
COUCEA09b | Gypsum Town of | Gypsum Town of WWTF | CO0048830 |
COUCRF03a | Aspen Consolidated Sanitation District | Aspen Consolidated San District | CO0026387 |
COUCRF03a | Woody Creek Mobile HOA | Woody Creek Mobile Home Park | COG588103 |
COUCRF03a | Aspen Village Inc c/o Independence Environmental Services | Aspen Village, INC. | COG588085 |
COUCRF03a | Riversbend HOA | Riverbend Apartments | COG588066 |
COUCRF03a | Independence Environmental Services | Lazy Glen Homeowners Assoc. | COG588049 |
COUCRF03a | Basalt SD | Basalt Sanitation District | COG588063 |
COUCRF03a | Ranch at Roaring Fork c/o Independence Environmental Services | Ranch at Roaring Fork HOA | COG588051 |
COUCRF03a | Carbondale Town of | Carbondale Town of | COG588050 |
COUCRF03a | Roaring Fork Water and San District | Roaring Fork WSD WWTF | CO0044750 |
COUCRF03a | Spring Valley SD | Spring Valley SD WWTF | CO0046124 |
COUCRF03a | Oak Meadows Service Company | Oak Meadows WWTF | CO0045802 |
COUCRF03c | Sunlight Inc | Sunlight, INC. | CO0038598 |
COUCRF03c | Mid Valley Metro District | Mid Valley Metro Dist WWTF | COG588105 |
COUCRF03c | Blue Creek Ranch LLC | Blue Creek Ranch | COG588074 |
COUCRF03c | H Lazy F LLC | H Lazy F MHP WWTF | COG588035 |
COUCRF03c | El Rocko Mobile Home Park | El Rocko MHP | COG588029 |
COUCRF04 | Snowmass WSD | Snowmass WSD | CO0023086 |
COUCRF08 | Sopris Engineering LLC | Redstone Castle WWTF | COG588115 |
COUCRF08 | Redstone WSD | Redstone WSD WWTF | CO0046370 |
COUCNP05b | Walden Town of | Walden Town of WWTF | CO0020788 |
COUCYA02a | Yampa Town of | Yampa WWTF | CO0030635 |
COUCYA02a | Routt County | Milner Community WWTF | CO0047449 |
COUCYA02c | Hayden Town of | Hayden Town WWTF | CO0040959 |
COUCYA02c | Steamboat Springs City of | Steamboat Springs, City of | CO0020834 |
COUCYA03 | Whiteman School | Whiteman School | CO0031062 |
COUCYA04 | Routt County Phippsburg/Dept of Envir Hlth | Routt CO for Phippsburg Comm WWTF | COG589026 |
COUCYA07 | Oak Creek Town of | Oak Creek, Town of | CO0041106 |
COUCYA08 | Steamboat Lake Water and Sanitation Dist | Steamboat Lake Water & Sanitation Dist WWTF | CO0035556 |
COUCYA22 | Morrison Creek Metropolitan Water and Sanitation District | Morrison Creek Metro WWTF | CO0022969 |
COUCYA22 | Steamboat Lake Water and Sanitation Dist | Steamboat Lake Water & Sanitation Dist WWTF | CO0035556 |
Prior to December 31, 2027:
* For segments located entirely above these facilities, nutrient standards apply to the entire segment.
* For segments with portions downstream of these facilities, nutrient standards only apply above these facilities. A note was added to the total phosphorus and chlorophyll a standards in these segments. The note references the table of qualified facilities at 33.5(4).
* For segments located entirely below these facilities, nutrient standards do not apply
A note was added to the total phosphorus and chlorophyll a standards in lakes segments as nutrients standards apply only to lakes and reservoirs larger than 25 acres surface area.
5 CCR 1002-33.5