Code of Colorado Regulations
1000 - Department of Public Health and Environment
1002 - Water Quality Control Commission (1002 Series)
5 CCR 1002-32 - REGULATION NO. 32 - CLASSIFICATIONS AND NUMERIC STANDARDS FOR ARKANSAS RIVER BASIN
Section 5 CCR 1002-32.5 - BASIC STANDARDS

Universal Citation: 5 CO Code Regs 1002-32 ยง 5

Current through Register Vol. 47, No. 5, March 10, 2024

(1) Temperature

All waters of the Arkansas River Basin 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.

(2) Qualifiers

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 which also have a water supply classification, and are applied to aquatic life class 2 streams which also have a water supply classification, on a case-by-case basis as shown in Appendix 32-1. The column in the tables at 31.11 and 31.16 Table III 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 32-1.

(3) Uranium

(a) All waters of the Arkansas River Basin are subject to the following basic standard for uranium, unless otherwise specified by a water quality standard applicable to a particular segment. However, discharges of uranium regulated by permits which are within these permit limitations shall not be a basis for enforcement proceedings under this basic standard.

(b) Uranium levels in surface waters shall be maintained at the lowest practicable level.

(c) In no case shall uranium levels in waters assigned a water supply classification be increased by any cause attributable to municipal, industrial, or agricultural discharges so as to exceed 16.8-30 µg/L or naturally-occurring concentrations (as determined by the State of Colorado), whichever is greater.
(i) The first number in the 16.8-30 µg/L range is a strictly health-based value, based on the Commission's established methodology for human health-based standards. The second number in the range is a maximum contaminant level, established under the federal Safe Drinking Water Act that has been determined to be an acceptable level of this chemical in public water supplies, taking treatability and laboratory detection limits into account. Control requirements, such as discharge permit effluent limitations, shall be established using the first number in the range as the ambient water quality target, provided that no effluent limitation shall require an "end-of-pipe" discharge level more restrictive than the second number in the range. Water bodies will be considered in attainment of this standard, and not included on the Section 303(d) List, so long as the existing ambient quality does not exceed the second number in the range.

(4) Nutrients

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 Arkansas River Basin. 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 Arkansas River Basin:

Segment

Permittee

Facility name

Permit No.

COARUA02b

Leadville MHC LLC

Lake Fork MHP

COG588060

COARUA03

Buena Vista Sanitation District

Buena Vista San Dist WWTF

CO0045748

COARUA03

Salida City of

Salida WWTF

CO0040339

COARUA04a

Fremont Sanitation District

Rainbow Park WWTF

CO0039748

COARUA05

Young Life Campaign Inc

Frontier Ranch

CO0034304

COARUA05

Moose Haven Condominiums

Moose Haven Condominums

CO0047279

COARUA05

Mountain View Villages Water & Sanitation District

Mountain View Villages

CO0048372

COARUA06

Leadville Sanitation District

Leadville San Dist WWTF

CO0021164

COARUA12a

Mount Princeton Hot Springs Resort

Mount Princeton Hot Springs Resort WWTF

COG588017

COARUA12a

Christian Mission Concerns

Silver Cliff Ranch

COG588102

COARUA13

Monarch Mountain Lodge

Garfield WWTF

CO0028444

COARUA13

PowderMonarch LLC

Monarch Ski Area

CO0031399

COARUA14d

Penrose Sanitation District

Penrose WWTF

CO0046523

COARUA14d

Royal Gorge Company of Colorado

Royal Gorge

CO0029033

COARUA21a

Cripple Creek City of

Cripple Creek WWTF

CO0039900

COARUA23

Victor City of

Victor WWTF

CO0024201

COARMA04a; COARMA04g

Pueblo West Metro District

Pueblo West Metro District WWTF

CO0040789

COARMA04c

Sunset Metropolitan District

Ellicott Springs WWTF

CO0047252

COARMA04c

Woodmen Hills Metropolitan District

Woodmen Hills Metro Dist WWTF

CO0047091

COARMA04d

Avondale Water and Sanitation District

Avondale and Fort Reynolds WWTF

CO0021075

COARMA04f

Cherokee Metropolitan District

Cherokee Metropolitan District WRF

COX048348

COARMA09

Colorado City Metropolitan District

Colorado City Metro Dist WWTF

CO0021121

COARMA13b

Cucharas Sanitation and Water District

Cucharas WWTF

CO0043745

COARMA14

La Veta Town of

La Veta WWTF

CO0032409

COARMA14

City of Walsenburg

Walsenburg City of

CO0020745

COARFO02a

Fountain Sanitation District

Fountain Sanitation District WWTF

CO0020532

COARFO02a

Colorado Springs Utilities

Las Vegas Street WWTF

CO0026735

COARFO02a

Security Sanitation District

Security Sanitation District WWTF

CO0024392

COARFO02a

Widefield Water and Sanitation District

Widefield WSD WWTF

CO0021067

COARFO04

Academy Water and Sanitation District

Academy Water and San Dist WWTF

COG589020

COARFO04

Broadmoor Park Properties

Broadmoor Park Properties

COG589021

COARFO04

Academy School Dist 20

Edith Wolford Elem School

CO0048429

COARFO04

Lower Fountain Metropolitan Sewage Disposal District

HDTRWRF

CO0000005

COARFO06

Colorado Springs Utilities

J D Phillips Water Reclamation Facility

CO0046850

COARFO06

Tri-Lakes Wastewater Treatment Facility

Tri-Lakes WWTF

CO0020435

COARFO06

Donala Water and Sanitation District

Upper Monument Crk Reg WWTF

CO0042030

COARLA01a

Pueblo City of

James R DiIorio WRF

CO0026646

COARLA01a

Meadowbrook MHP LLC

Meadowbrook MHP

COG588022

COARLA01b

Crowley County Correctional

Crowley Correctional Facility

CO0046795

COARLA01b

Colorado Dept of Corrections

Fort Lyon Correctional Facility WWTF

CO0046311

COARLA01b

Colorado Dept of Corrections

Fort Lyon Correctional Facility WWTF

CO0048801

COARLA01b

Fowler Town of

Fowler WWTF

CO0021571

COARLA01b

Las Animas City of

Las Animas WWTF

CO0040690

COARLA01b

North La Junta Sanitation District

North La Junta San Dist WWTF

CO0039519

COARLA01b

Rocky Ford City of

Rocky Ford WWTF

CO0023850

COARLA02a

Boone Town of

Boone WWTF

COG589116

COARLA02a

Calhan Town of

Calhan WWTF

COG589018

COARMA13c

Country Host Motel

Country Host Motel

COG589038

COARLA02a

Crowley Town of

Crowley WWTF

CO0041599

COARLA02a

Eads Town of

Eads WWTF

COG589016

COARLA02d

Limon, Town of

Limon WWTF

COG589023

COARLA02a

Simla Town of

Simla WWTF

COG589031

COARLA02d

Springfield Town of

Springfield WWTF

COG589102

COARLA02d

Colorado Dept of Corrections

Trinidad Correctional Facility

CO0046094

COARLA02b

La Junta City of

La Junta WWTF

CO0021261

COARLA05b

Trinidad City of

Trinidad WWTF

CO0024015

COARLA05b; COARLA06a

Cokedale Town of

Cokedale WWTF

CO0048461

COARLA07

Hoehne School District R-3

Hoehne School

COG588110

COARLA07

Trinidad City of

Trinidad WWTF

CO0031232

Unclassified

Colorado Dept of Natural Resources

Arkansas Point WWTF

COG589008

Unclassified

Manzanola, Town of

Manzanola WWTF

COG589012

Unclassified

Wiley Sanitation District

Wiley San Dist WWTF

COG589007

Prior to May 31, 2022:

* For segments located entirely above these facilities, nutrient standards apply to the entire segment.

* For segments with portions downstream of these facilities, nutrient standards apply only 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 32.5(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.

Disclaimer: These regulations may not be the most recent version. Colorado may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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