PlainEnviro

Colorado Water Quality

According to EPA Safe Drinking Water Information System (SDWIS), Colorado has 1,109 active community water systems in this extract. PlainEnviro's health-based slice lists 5,561 violation records across 50 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.

Health-based violation records for 1,109 community water systems in Colorado. Source: EPA Safe Drinking Water Information System (SDWIS).

Water Systems
1,109
Health-Based Violation Records
5,561
Systems with Violations
50
Cities with Issues
210

Water Systems with Most Health-Based Records

# Water System Health-Based Records Health
1 MAY VALLEY WA Wiley 440 Yes
2 SOUTH SWINK WATER AUTHORITY La Junta 269 Yes
3 VALLEY WC Manzanola 160 Yes
4 SUN MEADOW ESTATES Glenwood Springs 154 Yes
5 BEEHIVE WATER ASSOCIATION Cheraw 127 Yes
6 RYE TOWN OF Rye 119 Yes
7 COUNTRY ACRES MHP (LA SALLE COUNTY) Denver 106 Yes
8 VALLEY MOBILE HOME LLC Carbondale 104 Yes
9 MANZANOLA TOWN OF Manzanola 98 Yes
10 VROMAN WC Manzanola 96 Yes
11 CHERAW TOWN OF Cheraw 92 Yes
12 PATTERSON VALLEY WC Rocky Ford 90 Yes
13 EUREKA WC Rocky Ford 89 Yes
14 COLORADO CITY MD Colorado City 87 Yes
15 BURLINGTON CITY OF Burlington 83 Yes
16 FAYETTE WC Manzanola 72 Yes
17 EAST END WA La Junta 69 Yes
18 HOLBROOK CENTER SOFT WA La Junta 69 Yes
19 ROSA JOINT VENTURES WATER SYSTEM Ignacio 66 Yes
20 RIVERSIDE WC Rocky Ford 58 Yes
21 DIVIDE SOUTH Divide 49 Yes
22 PINEWOOD SPRINGS WD Lyons 48 Yes
23 FT LUPTON CITY OF Fort Lupton 48 Yes
24 ANNUNCIATION HEIGHTS Estes Park 47 Yes
25 NORTH HOLBROOK WC Rocky Ford 46 Yes
26 HOMESTEAD WC Evergreen 45 Yes
27 WEST GRAND VALLEY WA Rocky Ford 45 Yes
28 EMPIRE TOWN OF Empire 42 Yes
29 PARADOX PIPELINE CO Paradox 42 Yes
30 LOOKOUT MOUNTAIN WD Wheat Ridge 41 Yes
31 PAGELS TP Ft Morgan 40 Yes
32 HOLLY TOWN OF Holly 40 Yes
33 PALMER LAKE MOBILE HOME RANCH Palmer Lake 38 Yes
34 ELEPHANT ROCK MHP Colorado Springs 37 Yes
35 HASTY WATER AUTHORITY Hasty 36 Yes
36 OPHIR TOWN OF Ophir 36 Yes
37 LOUVIERS WSD Castle Rock 35 Yes
38 SHERIDAN LAKE WD Sheridan Lake 35 Yes
39 YANKEE SPRINGS MEADOWS Denver 35 Yes
40 OAK CREEK TOWN OF Oak Creek 33 Yes
41 STUCKER MESA DOMESTIC WC Hotchkiss 32 Yes
42 LITTLE ELK CREEK Snowmass 32 Yes
43 PINE DRIVE WD Beulah 32 Yes
44 UPPER SURFACE CREEK DOMESTIC WUA Cedaredge 31 Yes
45 PRITCHETT TOWN OF Pritchett 28 Yes
46 WALSENBURG CITY OF Walsenburg 28 Yes
47 ALPINE VILLAGE MHP Englewood 27 Yes
48 SOMERSET DOMESTIC WD Somerset 26 Yes
49 PEETZ TOWN OF Peetz 26 Yes
50 BEULAH WATER WORKS DISTRICT Beulah 26 Yes

Most Common Contaminants in Colorado

Contaminant Violations Systems Affected
Combined Radium (-226 and -228) 1,686 43
Gross Alpha, Excl. Radon and U 713 20
Surface Water Treatment Rule 660 101
TTHM 381 34
Stage 1 Disinfectants and Disinfection Byproducts Rule 329 176
Interim Enhanced Surface Water Treatment Rule 308 56
Total Haloacetic Acids (HAA5) 262 17
Groundwater Rule 251 76
Arsenic 201 11
Lead and Copper Rule 187 73
Combined Uranium 160 8
Nitrate 155 17
LEAD AND COPPER RULE REVISIONS 70 50
Revised Total Coliform Rule 62 18
Gross Alpha Particle Activity 43 1

Cities with Water Quality Issues

Denver Lakewood Colorado Springs Durango Glenwood Springs Cedaredge Littleton Wheat Ridge Windsor Carbondale Montrose Steamboat Springs Aurora Boulder Glendale Fort Collins Lafayette Centennial Bayfield Greenwood Village Paonia Trinidad Woodland Park Loveland Aspen Crested Butte Castle Rock Rocky Ford Pueblo Brighton Hotchkiss La Junta Englewood Basalt Divide Ignacio Monument Walsenburg Fort Lupton Thornton +170 more

Explore More

Colorado Environmental Overview → TRI Facilities in Colorado → National Water Quality → All States →

About This Data

Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in Colorado are included.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

Read our methodology - how this data is sourced, computed, and verified.