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Colorado Water Quality

Health violation data for 1,109 community water systems in Colorado. Based on EPA Safe Drinking Water Information System (SDWIS) data.

Water Systems
1,109
Total Violations
5,332
Systems with Violations
50
Cities with Issues
213

Water Systems with Most Violations

# Water System Violations Health
1 MAY VALLEY WA Wiley 412 Yes
2 SOUTH SWINK WATER AUTHORITY La Junta 264 Yes
3 VALLEY WC Manzanola 155 Yes
4 SUN MEADOW ESTATES Rifle 154 Yes
5 BEEHIVE WATER ASSOCIATION Cheraw 123 Yes
6 COUNTRY ACRES MHP (LA SALLE COUNTY) Denver 104 Yes
7 VALLEY MOBILE HOME LLC Carbondale 103 Yes
8 RYE TOWN OF Rye 100 Yes
9 MANZANOLA TOWN OF Manzanola 96 Yes
10 VROMAN WC Manzanola 93 Yes
11 CHERAW TOWN OF Cheraw 91 Yes
12 COLORADO CITY MD Colorado City 87 Yes
13 PATTERSON VALLEY WC Rocky Ford 86 Yes
14 EUREKA WC Rocky Ford 85 Yes
15 BURLINGTON CITY OF Burlington 83 Yes
16 FAYETTE WC Manzanola 69 Yes
17 EAST END WA La Junta 67 Yes
18 HOLBROOK CENTER SOFT WA La Junta 66 Yes
19 ROSA JOINT VENTURES WATER SYSTEM Ignacio 58 Yes
20 RIVERSIDE WC Rocky Ford 56 Yes
21 DIVIDE SOUTH Divide 49 Yes
22 FT LUPTON CITY OF Fort Lupton 48 Yes
23 ANNUNCIATION HEIGHTS Estes Park 47 Yes
24 HOMESTEAD WC Evergreen 45 Yes
25 PINEWOOD SPRINGS WD Lyons 43 Yes
26 NORTH HOLBROOK WC Rocky Ford 43 Yes
27 WEST GRAND VALLEY WA Rocky Ford 43 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 PALMER LAKE MOBILE HOME RANCH Palmer Lake 38 Yes
33 HOLLY TOWN OF Holly 37 Yes
34 HASTY WC Hasty 36 Yes
35 ELEPHANT ROCK MHP Colorado Springs 36 Yes
36 OPHIR TOWN OF Ophir 36 Yes
37 SHERIDAN LAKE WD Sheridan Lake 35 Yes
38 LOUVIERS WSD Castle Rock 34 Yes
39 STUCKER MESA DOMESTIC WC Hotchkiss 32 Yes
40 UPPER SURFACE CREEK DOMESTIC WUA Cedaredge 31 Yes
41 LITTLE ELK CREEK Snowmass 31 Yes
42 YANKEE SPRINGS MEADOWS Denver 31 Yes
43 OAK CREEK TOWN OF Oak Creek 30 Yes
44 PINE DRIVE WD Beulah 29 Yes
45 WALSENBURG CITY OF Walsenburg 28 Yes
46 PRITCHETT TOWN OF Pritchett 27 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
Lead & Copper Rule 1,626 43
Copper 690 20
Arsenic 626 101
Total Trihalomethanes (TTHM) 377 34
Chlorine 316 175
Turbidity 302 56
Haloacetic Acids (HAA5) 239 17
Fluoride 236 75
Barium 190 11
Combined Radium 226/228 183 72
Lead (Action Level) 157 7
Nitrate 153 17
E. coli 60 18
Gross Alpha 48 39
PFOA + PFOS 42 1

Cities with Water Quality Issues

Aurora Broomfield Lafayette Louisville Wheat Ridge Castle Rock Englewood Littleton Brighton Denver Lakewood Boulder Empire Frederick Fort Collins Johnstown Loveland Greeley Wellington Windsor Eaton Fort Lupton Hudson Fountain Victor Colorado Springs Pueblo Pueblo West Lamar Alamosa Florence Durango Nucla Sedalia Ouray Rifle Thornton Gilcrest Keenesburg Weldona +173 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 U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

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