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Colorado Water Quality

2,193 public water systems serving 7,473,456 people.

Water Systems
2,193
Total Violations
238,796
Violation Rate
92.6%
PFAS Detection
60.1%
98 of 163 tested

Largest Water Systems

DENVER WATER BOARD
DENVER, CO · 1,287,000 served
383 violations
AURORA CITY OF
AURORA, CO · 533,407 served
18 violations
COLORADO SPRINGS UTILITIES
COLORADO SPRINGS, CO · 464,111 served
18 violations
THORNTON CITY OF
THORNTON, CO · 226,465 served
36 violations
WESTMINSTER CITY OF
WESTMINSTER, CO · 202,078 served
18 violations
FT COLLINS CITY OF
FORT COLLINS, CO · 179,901 served
49 violations
ARVADA CITY OF
ARVADA, CO · 171,610 served
18 violations
BOULDER CITY OF
BOULDER, CO · 166,080 served
31 violations
GREELEY CITY OF
GREELEY, CO · 132,310 served
49 violations
PUEBLO BOARD OF WW
PUEBLO, CO · 114,070 served
75 violations
CASTLE ROCK TOWN OF
CASTLE ROCK, CO · 106,822 served
52 violations
BROOMFIELD CITY AND COUNTY OF
BROOMFIELD, CO · 106,153 served
12 violations
HIGHLANDS RANCH WSD
HIGHLANDS RANCH, CO · 103,444 served
13 violations
LONGMONT CITY OF
LONGMONT, CO · 102,866 served
78 violations
LOVELAND CITY OF
LOVELAND, CO · 95,471 served
23 violations
UTE WCD
GRAND JUNCTION, CO · 91,186 served
19 violations
CONSOLIDATED MUTUAL MAPLE GROVE
LAKEWOOD, CO · 81,400 served
18 violations
PARKER WSD
PARKER, CO · 75,949 served
466 violations
SOUTH ADAMS COUNTY WSD
COMMERCE CITY, CO · 74,341 served
EAST CHERRY CREEK VALLEY WSD
AURORA, CO · 66,130 served
1,783 violations

Most Violations

#1 HAPPY CAMPER RV PARK PAGOSA SPRINGS
2,875
#2 CREEKSIDE SOUTH ESTATES METRO DISTRICT WINDSOR
2,820
#3 ESTATES AT BROMLEY HUDSON
2,787
#4 MAY VALLEY WA WILEY
2,247
#5 PACHECO TRAILER PARK MONTE VISTA
2,060
#6 PAINT BRUSH HILLS FALCON
1,810
#7 EAST CHERRY CREEK VALLEY WSD AURORA
1,783
#8 BURLINGTON CITY OF BURLINGTON
1,699
#9 SEEDORF WS YUMA
1,606
#10 PARKVILLE WD LEADVILLE
1,268
#11 GAYTAN WS YUMA
1,247
#12 FRUITLAND DOMESTIC WC HOTCHKISS
1,196
#13 WISHING WELL MOTEL CASTLE ROCK
1,181
#14 FLORISSANT WSD FLORISSANT
1,146
#15 MERIDIAN POINT CHURCH PEYTON
1,128

Counties in Colorado

Denver
5 systems · 1,312,794 served · 487 violations
Arapahoe
40 systems · 864,434 served · 5,553 violations
El Paso
140 systems · 757,938 served · 21,020 violations
Adams
86 systems · 711,442 served · 11,205 violations
Jefferson
113 systems · 577,729 served · 5,182 violations
Larimer
136 systems · 519,497 served · 9,218 violations
Boulder
82 systems · 428,472 served · 7,231 violations
Douglas
73 systems · 417,473 served · 7,411 violations
Weld
77 systems · 359,543 served · 4,558 violations
Pueblo
29 systems · 167,384 served · 4,552 violations
Mesa
37 systems · 163,215 served · 2,022 violations
Broomfield
3 systems · 108,783 served · 24 violations
Eagle
47 systems · 103,381 served · 4,199 violations
Summit
42 systems · 89,593 served · 4,364 violations
La Plata
110 systems · 62,563 served · 9,256 violations
Garfield
86 systems · 61,334 served · 7,428 violations
Fremont
32 systems · 57,902 served · 2,460 violations
Montrose
26 systems · 56,323 served · 3,807 violations
Grand
79 systems · 56,214 served · 6,442 violations
Pitkin
50 systems · 53,372 served · 6,062 violations
Routt
50 systems · 50,449 served · 5,239 violations
Montezuma
18 systems · 31,851 served · 1,218 violations
Morgan
8 systems · 28,903 served · 1,287 violations
Gunnison
74 systems · 28,235 served · 4,404 violations
Delta
42 systems · 27,718 served · 7,243 violations
Clear Creek
31 systems · 26,778 served · 2,262 violations
Chaffee
70 systems · 24,956 served · 5,369 violations
Teller
51 systems · 23,723 served · 9,700 violations
Gilpin
21 systems · 22,561 served · 989 violations
San Miguel
20 systems · 22,019 served · 4,325 violations

Showing top 30 of 64 counties.

View all 2,193 systems in Colorado →