Colorado Water Systems

Compiled by PlainEnviro · August 25, 2026

1,109 community water systems in Colorado, ranked by violation count. Data from EPA Safe Drinking Water Information System (SDWIS).

Water Systems

1,109

Health-Based Violation Records

5,561

Health Violations

439 systems

Population Served

7,217,682

Colorado community water systems are regulated by the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act; each utility files compliance results with the state's primacy agency and, for federally listed contaminants, with the U.S. Environmental Protection Agency directly. PlainEnviro's health-based SDWIS extract above counts health-based exceedances only -- monitoring and reporting violations are not present in these figures.

Violation counts reflect both infrastructure realities and reporting diligence, a state with more small rural systems will accumulate more monitoring-type violations without necessarily delivering worse water. Health-based violations are the stronger safety signal. A past violation does not itself indicate current unsafe water; utilities must notify customers, remediate, and publish an annual Consumer Confidence Report. All numbers below draw directly from the federal SDWIS record.

Which water systems have violations? (176)

#	System Name	City	Source	Violations	Pop. Served	Health
1	MAY VALLEY WA Wiley	Wiley	Groundwater	440	1,500	Yes
2	SOUTH SWINK WATER AUTHORITY La Junta	La Junta	Groundwater	269	622	Yes
3	RYE TOWN OF Rye	Rye	Surface Water	119	745	Yes
4	MANZANOLA TOWN OF Manzanola	Manzanola	Groundwater	98	497	Yes
5	EUREKA WC Rocky Ford	Rocky Ford	Groundwater	89	498	Yes
6	COLORADO CITY MD Colorado City	Colorado City	Surface Water	87	2,755	Yes
7	BURLINGTON CITY OF Burlington	Burlington	Groundwater	83	3,720	Yes
8	FT LUPTON CITY OF Fort Lupton	Fort Lupton	Surface Water	48	12,099	Yes
9	PINEWOOD SPRINGS WD Lyons	Lyons	Surface Water	48	745	Yes
10	HOMESTEAD WC Evergreen	Evergreen	Surface Water	45	1,000	Yes
11	EMPIRE TOWN OF Empire	Empire	Surface Water	42	500	Yes
12	LOOKOUT MOUNTAIN WD Wheat Ridge	Wheat Ridge	Surface Water	41	1,378	Yes
13	HOLLY TOWN OF Holly	Holly	Groundwater	40	800	Yes
14	YANKEE SPRINGS MEADOWS Denver	Denver	Groundwater	35	710	Yes
15	OAK CREEK TOWN OF Oak Creek	Oak Creek	Surface Water	33	950	Yes
16	PINE DRIVE WD Beulah	Beulah	Surface Water	32	416	Yes
17	UPPER SURFACE CREEK DOMESTIC WUA Cedaredge	Cedaredge	Surface Water	31	2,800	Yes
18	WALSENBURG CITY OF Walsenburg	Walsenburg	Surface Water	28	3,230	Yes
19	BEULAH WATER WORKS DISTRICT Beulah	Beulah	Surface Water	26	445	Yes
20	WALSH TOWN OF Walsh	Walsh	Groundwater	25	650	Yes
21	TELLURIDE TOWN OF Telluride	Telluride	Surface Water	24	7,900	Yes
22	MONUMENT TOWN OF Monument	Monument	Groundwater	22	5,740	Yes
23	LA VETA TOWN OF La Veta	La Veta	Surface Water	21	850	Yes
24	RIVERVIEW CG Windsor	Windsor	Surface Water	20	450	Yes
25	YMCA ROCKIES WIND RIVER Estes Park	Estes Park	Surface Water	19	3,730	Yes
26	TELLER COUNTY WSD Woodland Park	Woodland Park	Groundwater	18	600	Yes
27	ST MARYS GLACIER WSD Wheat Ridge	Wheat Ridge	Surface Water	16	451	Yes
28	VICTOR CITY OF Victor	Victor	Surface Water	15	491	Yes
29	RIDGWAY TOWN OF Ridgway	Ridgway	Surface Water	14	1,000	Yes
30	NATURITA TOWN OF Naturita	Naturita	Surface Water	13	585	Yes
31	WELLINGTON TOWN OF Wellington	Wellington	Surface Water	12	11,720	Yes
32	HUDSON TOWN OF Hudson	Hudson	Surface Water	12	3,350	Yes
33	FOWLER TOWN OF Fowler	Fowler	Surface Water	12	1,169	Yes
34	DONALA WSD Colorado Springs	Colorado Springs	Surface Water	11	6,421	Yes
35	DOVE CREEK TOWN OF Dove Creek	Dove Creek	Surface Water	11	850	Yes
36	MT WERNER WD Steamboat Springs	Steamboat Springs	Surface Water	10	19,000	Yes
37	LAKE DURANGO WA Durango	Durango	Surface Water	10	1,577	Yes
38	PINE BLUFFS, TOWN OF Fort Collins	Fort Collins	Groundwater	10	1,186	Yes
39	ANTONITO TOWN OF Antonito	Antonito	Surface Water	10	981	Yes
40	MT VERNON COUNTRY CLUB Greenwood Village	Greenwood Village	Surface Water	10	734	Yes
41	GRANADA TOWN OF Granada	Granada	Groundwater	10	515	Yes
42	YAMPA TOWN OF Yampa	Yampa	Surface Water	10	467	Yes
43	EVERGREEN LAKE COMPANY Cimarron	Cimarron	Surface Water	10	431	Yes
44	STEAMBOAT II MD Steamboat Springs	Steamboat Springs	Surface Water	9	1,450	Yes
45	GRAND COUNTY WATER NO 1 Winter Park	Winter Park	Surface Water	8	5,400	Yes
46	PAONIA TOWN OF Paonia	Paonia	Surface Water	8	2,499	Yes
47	TOWAOC WATER SYSTEM Towaoc	Towaoc	Surface Water	8	2,020	Yes
48	HIGHLAND LAKES WD Divide	Divide	Surface Water	8	875	Yes
49	BRIGHTON CITY OF Brighton	Brighton	Surface Water	6	56,304	Yes
50	PUEBLO WEST MD Pueblo West	Pueblo West	Surface Water	6	30,000	Yes
51	BRECKENRIDGE TOWN OF Breckenridge	Breckenridge	Surface Water	6	28,315	Yes
52	JOHNSTOWN TOWN OF Johnstown	Johnstown	Surface Water	6	27,295	Yes
53	BERTHOUD TOWN OF Berthoud	Berthoud	Surface Water	6	14,211	Yes
54	CARBONDALE TOWN OF Carbondale	Carbondale	Surface Water	6	6,700	Yes
55	INDIAN HILLS WD Lakewood	Lakewood	Surface Water	6	1,300	Yes
56	FOREST VIEW ACRES WD Greenwood Village	Greenwood Village	Surface Water	6	772	Yes
57	BROOMFIELD CITY AND COUNTY OF Broomfield	Broomfield	Surface Water	5	106,153	Yes
58	SUPERIOR MD NO 1 Superior	Superior	Surface Water	5	17,900	Yes
59	MANITOU SPRINGS CITY OF Manitou Springs	Manitou Springs	Surface Water	5	6,938	Yes
60	KREMMLING TOWN OF Kremmling	Kremmling	Surface Water	5	1,859	Yes
61	SPRINGFIELD TOWN OF Springfield	Springfield	Groundwater	5	1,378	Yes
62	STRATTON TOWN OF Stratton	Stratton	Groundwater	5	960	Yes
63	GARDEN VALLEY Colorado Springs	Colorado Springs	Groundwater	5	900	Yes
64	CHEYENNE WELLS TOWN OF Cheyenne Wells	Cheyenne Wells	Groundwater	5	840	Yes
65	ELBERT CREEK WATER CO Durango	Durango	Surface Water	5	750	Yes
66	MASON MANOR Denver	Denver	Groundwater	5	630	Yes
67	VALLEY MAINT CORP NO 1 Colorado Springs	Colorado Springs	Groundwater	5	470	Yes
68	LOUISVILLE CITY OF Louisville	Louisville	Surface Water	4	20,975	Yes
69	RIFLE CITY OF Rifle	Rifle	Surface Water	4	9,489	Yes
70	KEENESBURG TOWN OF Keenesburg	Keenesburg	Groundwater	4	4,650	Yes
71	PARK CENTER WD Canon City	Canon City	Surface Water	4	4,000	Yes
72	PONCHA SPRINGS TOWN OF Poncha Springs	Poncha Springs	Groundwater	4	2,118	Yes
73	JULESBURG TOWN OF Julesburg	Julesburg	Groundwater	4	1,225	Yes
74	MILE HI WATER INC HAULER Boulder	Boulder	Surface Water	4	1,000	Yes
75	ALMA TOWN OF Alma	Alma	Surface Water	4	460	Yes
76	RICO TOWN OF Rico	Rico	Groundwater	4	437	Yes
77	GREEN MOUNTAIN WSD Lakewood	Lakewood	Surface Water	3	49,400	Yes
78	WIDEFIELD WSD Colorado Springs	Colorado Springs	Surface Water	3	27,640	Yes
79	ESTES PARK TOWN OF Estes Park	Estes Park	Surface Water	3	16,722	Yes
80	ROXBOROUGH WSD Littleton	Littleton	Surface Water	3	13,765	Yes
81	STEAMBOAT SPRINGS CITY OF Steamboat Springs	Steamboat Springs	Surface Water	3	9,950	Yes
82	FLORENCE CITY OF Florence	Florence	Surface Water	3	7,500	Yes
83	EATON TOWN OF Eaton	Eaton	Surface Water	3	7,328	Yes
84	DACONO CITY OF Dacono	Dacono	Surface Water	3	6,900	Yes
85	SNOWMASS VILLAGE WSD Snowmass Village	Snowmass Village	Surface Water	3	6,353	Yes
86	PENROSE WD Penrose	Penrose	Surface Water	3	3,149	Yes
87	LYONS TOWN OF Lyons	Lyons	Surface Water	3	2,990	Yes
88	NEDERLAND TOWN OF Nederland	Nederland	Surface Water	3	2,406	Yes
89	STRASBURG WSD Strasburg	Strasburg	Groundwater	3	2,050	Yes
90	HOTCHKISS TOWN OF Hotchkiss	Hotchkiss	Surface Water	3	2,050	Yes
91	MOUNTAIN WSD Conifer	Conifer	Surface Water	3	1,941	Yes
92	WEST OLIVE ESTATES Denver	Denver	Groundwater	3	1,850	Yes
93	DURANGO WEST MD NO 2 Durango	Durango	Surface Water	3	930	Yes
94	DEBEQUE TOWN OF Debeque	Debeque	Surface Water	3	911	Yes
95	FAIRPLAY TOWN OF Fairplay	Fairplay	Surface Water	3	909	Yes
96	SAN LAZARO MFCTD HOUSING COMMUNITY Lafayette	Lafayette	Surface Water	3	844	Yes
97	IGNACIO TOWN OF Ignacio	Ignacio	Surface Water	3	800	Yes
98	EL MORRO MOBILE ESTATES Littleton	Littleton	Surface Water	3	504	Yes
99	RED CLIFF TOWN OF Red Cliff	Red Cliff	Surface Water	3	469	Yes
100	AGUILAR TOWN OF Aguilar	Aguilar	Groundwater	3	447	Yes
101	MITCHELL COOPER DITCH PIPELINE Glenwood Springs	Glenwood Springs	Surface Water	3	415	Yes
102	AVILLA EASTLAKE Greenwood Village	Greenwood Village	Surface Water	3	410	Yes
103	FT COLLINS CITY OF Fort Collins	Fort Collins	Surface Water	2	179,901	Yes
104	BOULDER CITY OF Boulder	Boulder	Surface Water	2	166,080	Yes
105	WOODMOOR WSD Monument	Monument	Surface Water	2	18,031	Yes
106	CORTEZ CITY OF Cortez	Cortez	Surface Water	2	8,770	Yes
107	EAGLE TOWN OF Eagle	Eagle	Surface Water	2	7,511	Yes
108	SOUTH SHERIDAN WATER AND SEWER DIST Greenwood Village	Greenwood Village	Surface Water	2	2,500	Yes
109	AKRON TOWN OF Akron	Akron	Groundwater	2	2,379	Yes
110	FLAGLER TOWN OF Flagler	Flagler	Groundwater	2	2,160	Yes
111	OURAY CITY OF Ouray	Ouray	Surface Water	2	1,460	Yes
112	DEL NORTE TOWN OF Del Norte	Del Norte	Groundwater	2	1,429	Yes
113	THE GROVE AT ALTA RIDGE Thornton	Thornton	Surface Water	2	1,300	Yes
114	ARBORDALE ACRES MHP Lafayette	Lafayette	Surface Water	2	901	Yes
115	NUCLA TOWN OF Nucla	Nucla	Surface Water	2	875	Yes
116	PIEDRA PARK MD Bayfield	Bayfield	Surface Water	2	850	Yes
117	ROGERS MESA WC Hotchkiss	Hotchkiss	Surface Water	2	840	Yes
118	DEER CREEK WD Wheat Ridge	Wheat Ridge	Groundwater	2	792	Yes
119	DURANGO WEST MD NO 1 Durango	Durango	Surface Water	2	750	Yes
120	MILE HIGH WC Broomfield	Broomfield	Surface Water	2	700	Yes
121	SKYLINE VILLAGE MOBILE HOME PK Littleton	Littleton	Surface Water	2	700	Yes
122	SWINK TOWN OF Swink	Swink	Groundwater	2	660	Yes
123	OTIS TOWN OF Otis	Otis	Groundwater	2	600	Yes
124	COUNTRYSIDE ESTATES PUEBLO Pueblo	Pueblo	Surface Water	2	508	Yes
125	ROCKVALE TOWN OF Rockvale	Rockvale	Surface Water	2	504	Yes
126	MONTEZUMA CNTY WD NO 1 Cortez	Cortez	Surface Water	2	490	Yes
127	MOUNTAINSIDE ESTATES MHP Lakewood	Lakewood	Surface Water	2	473	Yes
128	BELLEVIEW CHRISTIAN COLLEGE Westminster	Westminster	Groundwater	2	460	Yes
129	GROVELAND MANOR Denver	Denver	Groundwater	2	435	Yes
130	ENGLEWOOD CITY OF Englewood	Englewood	Surface Water	1	57,332	Yes
131	CLIFTON WD Clifton	Clifton	Surface Water	1	34,500	Yes
132	WHEAT RIDGE WATER DISTRICT Wheat Ridge	Wheat Ridge	Surface Water	1	20,000	Yes
133	US AIR FORCE ACADEMY Usaf Academy	Usaf Academy	Surface Water	1	16,876	Yes
134	NORTH WASHINGTON STREET WSD Denver	Denver	Surface Water	1	14,500	Yes
135	PINERY WWD Parker	Parker	Surface Water	1	12,901	Yes
136	WOODLAND PARK CITY OF Woodland	Woodland	Surface Water	1	8,500	Yes
137	STRATMOOR HILLS WSD Colorado Springs	Colorado Springs	Surface Water	1	6,500	Yes
138	NEW CASTLE TOWN OF New Castle	New Castle	Surface Water	1	5,024	Yes
139	FRISCO TOWN OF Frisco	Frisco	Surface Water	1	4,495	Yes
140	SILT TOWN OF Silt	Silt	Surface Water	1	3,536	Yes
141	ADVENIR FRENCH QUARTER Denver	Denver	Surface Water	1	3,447	Yes
142	SILVERTON TOWN OF Silverton	Silverton	Surface Water	1	2,387	Yes
143	SPRING CANYON WSD Fort Collins	Fort Collins	Surface Water	1	2,320	Yes
144	LAS ANIMAS CITY OF Las Animas	Las Animas	Groundwater	1	2,139	Yes
145	KIMBERLY HILLS MHP Lakewood	Lakewood	Surface Water	1	2,005	Yes
146	EL JEBEL MHP El Jebel	El Jebel	Surface Water	1	1,962	Yes
147	AVONDALE WSD Avondale	Avondale	Groundwater	1	1,615	Yes
148	DENVER CASCADE MHP Wheat Ridge	Wheat Ridge	Surface Water	1	1,200	Yes
149	MINTURN TOWN OF Minturn	Minturn	Surface Water	1	1,200	Yes
150	EDGEMONT RANCH MD Durango	Durango	Surface Water	1	1,200	Yes
151	GILCREST TOWN OF Gilcrest	Gilcrest	Surface Water	1	1,150	Yes
152	PALMS OF ARCHER Denver	Denver	Groundwater	1	1,092	Yes
153	NORTH LINCOLN WSD Denver	Denver	Surface Water	1	1,000	Yes
154	PARK FOREST Colorado Springs	Colorado Springs	Groundwater	1	930	Yes
155	HUGO TOWN OF Hugo	Hugo	Groundwater	1	885	Yes
156	SAN JUAN RIVER VILLAGE MD Pagosa Springs	Pagosa Springs	Surface Water	1	877	Yes
157	GOLDEN TERRACE WEST Wheat Ridge	Wheat Ridge	Surface Water	1	825	Yes
158	CALHAN TOWN OF Calhan	Calhan	Groundwater	1	780	Yes
159	SPRING HILL MHP Denver	Denver	Groundwater	1	764	Yes
160	ACADEMY WSD Castle Rock	Castle Rock	Groundwater	1	750	Yes
161	COLORADO MTN COLLEGE SVC Glenwood Springs	Glenwood Springs	Groundwater	1	715	Yes
162	KEYSTONE RANCH Keystone	Keystone	Groundwater	1	670	Yes
163	FRIENDLY VILLAGE OF GREELEY MHP Lakewood	Lakewood	Surface Water	1	660	Yes
164	PRAIRIE GREENS MHP Frederick	Frederick	Surface Water	1	654	Yes
165	LAKE CITY TOWN OF Lake City	Lake City	Groundwater	1	587	Yes
166	GOLDEN TERRACE VILLAGE Wheat Ridge	Wheat Ridge	Surface Water	1	580	Yes
167	KV HOA INC Moffat	Moffat	Groundwater	1	580	Yes
168	COSTILLA COUNTY WS San Luis	San Luis	Groundwater	1	561	Yes
169	BRUSH CREEK WD Aspen	Aspen	Surface Water	1	516	Yes
170	CRAWFORD MESA WA Crawford	Crawford	Groundwater	1	486	Yes
171	CHEYENNE MOUNTAIN ESTATES MHP Lafayette	Lafayette	Surface Water	1	472	Yes
172	WESTWOOD LAKES WD Woodland Park	Woodland Park	Groundwater	1	450	Yes
173	FLEMING TOWN OF Fleming	Fleming	Groundwater	1	446	Yes
174	FSI HOLLY HILLS PROPERTY LLC Denver	Denver	Groundwater	1	435	Yes
175	GOLDEN TERRACE SOUTH Wheat Ridge	Wheat Ridge	Surface Water	1	425	Yes
176	ALEDO MOBILE HOME PARK Denver	Denver	Groundwater	1	423	Yes

Systems with No Violations (324)

324 water systems in Colorado have zero recorded violations. Showing the 50 largest by population served.

DENVER WATER BOARD (1,287,000) AURORA CITY OF (533,407) COLORADO SPRINGS UTILITIES (464,111) THORNTON CITY OF (226,465) WESTMINSTER CITY OF (202,078) ARVADA CITY OF (171,610) GREELEY CITY OF (132,310) PUEBLO BOARD OF WW (114,070) CASTLE ROCK TOWN OF (110,298) LONGMONT CITY OF (104,178) HIGHLANDS RANCH WSD (103,444) UTE WCD (92,580) LOVELAND CITY OF (91,077) CONSOLIDATED MUTUAL MAPLE GROVE (81,400) PARKER WSD (75,949) SOUTH ADAMS COUNTY WSD (75,559) EAST CHERRY CREEK VALLEY WSD (66,130) FT COLLINS LOVELAND WD (63,532) SOUTHGATE WSD (55,000) EAGLE RIVER WSD (51,515) NORTHGLENN CITY OF (48,927) SOUTHWEST METROPOLITAN WSD (48,648) US DEPARTMENT OF THE ARMY FORT CARSON (48,000) ERIE TOWN OF (47,444) BANCROFT CLOVER WSD (44,000) GOLDEN CITY OF (38,288) CANON CITY CITY OF (34,800) DURANGO CITY OF (33,787) ASPEN CITY OF (31,100) ARAPAHOE CNTY WWWA (31,000) BEAR CREEK WSD (30,000) CHEROKEE MD (29,610) LAFAYETTE CITY OF (28,700) EAST LARIMER COUNTY WD (27,944) FIRESTONE TOWN OF (27,798) CSU MAIN AND WEST HOUSING CAMPUS (27,375) GRAND JUNCTION CITY OF (26,000) LITTLE THOMPSON WD (25,654) FOUNTAIN CITY OF (25,130) CRESTVIEW WSD (23,756) WINDSOR TOWN OF (23,500) MERIDIAN MD (23,415) CHERRY CREEK VALLEY WSD (22,000) TRI COUNTY WCD (20,490) LEFT HAND WD (20,280) SECURITY WATER DISTRICT (20,000) PLATTE CANYON WSD (19,485) EVANS CITY OF (19,369) MONTROSE CITY OF (19,305) WILLOWS WD (19,000) +274 more

All Water Systems in Colorado (1,109)

Page 12 of 23, ordered by population served.

System	Population Served	Violations
ILIFF TOWN OF	328	0
IMPERIAL MHC	328	0
KIT CARSON TOWN OF	326	4
EAST FLORENCE WA	326	0
GREEN ACRES MHP	325	1
BEVERLY HILLS MUTUAL WC	325	1
ARABIAN ACRES MD	325	2
WJ METRO DISTRICT	324	1
SOUTHWEST HORIZON RANCH	323	0
LAZY GLEN HOA	322	1
ILIUM VALLEY WS	322	2
MOUNTAIN VIEW WUA	320	3
THE ASPENS MOBILE HOME VILLAGE	318	1
ALPINE VISTA VILLAGE	313	0
CHATFIELD SOUTH WD	312	0
SUNFLOWER VALLEY PIPELINE ASSN	312	0
TIMBER CREEK WD	312	0
HILLROSE TOWN OF	310	0
ELDORADO MUNICIPAL SYSTEM	308	1
CHAPARRAL VILLAGE MHP	303	0
BRIGGSDALE WC	303	0
ASPEN RIDGE MHC	302	0
SILVER HEIGHTS WSD	301	0
WHITE MESA WATER SYSTEM	300	1
THORNTON ESTATES	300	0
FORT LYON	300	0
EAST BOULDER COUNTY WD	300	0
ELBERT WSD	300	0
PRAIRIE WC	300	0
FALCON HEIGHTS POA	300	0
ASPEN EQUESTRIAN BLUE CREEK RANCH	300	0
CAVERN SPRINGS MHC, LLC	300	0
RANCH AT ROARING FORK	300	1
PAGELS TP	300	40
WILL O WISP METRO DISTRICT	300	2
ASPEN VILLAGE MD	300	6
STARWOOD METROPOLITAN DISTRICT	300	0
COUNTRY ESTATES MOBILE HOME PARK	297	0
TERRACE PARK MHP	297	3
SEIBERT TOWN OF	296	1
OLD ORCHARD ESTATES	296	6
PITKIN MESA PIPELINE CO	295	9
PEETZ TOWN OF	295	26
CRESTONE WS	293	2
MEADOW STREAMS ESTATES	293	16
ANIMAS VIEW MHP CO-OP	292	0
RED SKY RANCH	291	12
ASPEN SPRINGS MD	290	0
WILSON MESA	290	0
RIFLE CORRECTIONAL CENTER	287	0

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Frequently Asked Questions

How many water systems are in Colorado?

Colorado has 1,109 community water systems tracked by the EPA, serving a combined population of 7,217,682 people.

How many water systems in Colorado have health violations?

439 water systems in Colorado have health-based violations, which include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. These represent 40% of all systems in the state.

How many health-based violation records are in this extract for Colorado?

PlainEnviro's health-based EPA SDWIS extract contains 5,561 records joined to 1,109 active community water systems in Colorado. Monitoring and reporting records are not included.

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About This Data

Water system data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations that may pose a direct risk to public health. Only community water systems (CWS) are included.

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

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

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