WSP00398

• File Number: 8200.760
• Description: Yampa River General
• State: CO
• Basin: Yampa/White
• Water Division: 6
• Date: 4/1/1980
• Author: USGS
• Title: Analysis of Stream Quality in the Yampa River Basin - Colorado and Wyoming - 1980
• Water Supply Pro - Doc Type: Report/Study

Table 5.--Water-quality standards for water use in Col.orado-cContinued

o
o
N
<:;.;I
t~.,,A.
0J

Water-qua 1 i ty
variable

National (U.S. Environmental Pro-
tection IIgency, 1976a; 1976b; 1977)
and proposed Colorado (Colorado
Department of Heal th, 1977a)
drinking-water regulations

Proposed Colorado water-quality standards
(Colorado Department of Health, 1977b)

Water supp I y1

Aquatic life2

Agriculture3

Biological variables

Fecal col iforms (per
100 mL)------------------

8'171

18>190

181,000

Miscellaneous variables

Ammonia (mg/L as N)-------- ------------ 200.5 210.02 ---------
Chlorine (total residual;
mg/L)-------------------- ------------ ---------- 22 .002 ---------
Color (color units)-------- s15 ---------- ----------- ---------
Cyanide (mg/L)------------- ------------ .2 .005 0.2
'"
-"" Foaming agents (mg/L)------ s .5 ---------- ----------- ---------
Nitrite (mg/L as N)-------- ------------ 1.0 23 .05 10
Odor (threshold odor
number)------------------ 53 ---------- ----------- ...--------
Sulfide as H2S (mg/L) ------ s .05 .05 .002 ---------
Turbidity (TU)------------- 8'241 251.0 ----------- ---------

Ilncludes uncontaminated ground water and- ground and surface water requiring disinfection or standard
treatment (raw water).
21ncludes cold-water biota (inhabitants,. j.ncluding trout, of waters where temperatures- do not normally exceed
200C) and warm-water biota' (inhabitants of waters'where temperatures normally exceed ZOOC). Trace-element stand-
ards apply to waters hav-ing. total hardness from 0 to 100 mg/L as CaC03; standards for waters of greater hardness
may be equal or greater. Total ,trace-element concentrations- are given, unless otherwise specified.
3-1ncludes irrigation and stock water.ing.
4Applies only to cold-wate"r 'biota; standard f.or warm-water biota is 3"00(.. In addition, a maximum 30e in-
crease over a minimum 4-hour period lasting for 12 hours maximum from naturally occurring temperatures sha-ll be
allowed..
5Secondary maximum contaminant level. These 11* * * are not Federally enforceable 'and are intended as guide-
I ines for the States * * *" (U.S. Environmental Protection Agency, 1977).
6Applies only to ground 'and surface water requiring disinfection or standard treatment- (raw water).
.7Minimum allowed concentration. Appl ies only to cold-water biota; standard for warm-water biota is 5.0 mg/L.
In addition, a 7.0-mg/L standard during periods of spawning of cold-water fish may be set on a case-by-case basis.

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