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AquaCensus

Colorado public water systems

2,207 active systems regulated under the Safe Drinking Water Act, serving a reported 7.5M people across 113 counties.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

2,207

Population served

7.5M

Community systems

1,068

Groundwater share

74.4%

System types in Colorado

1,068

Community water system

183

Non-transient non-community water system

956

Transient non-community water system

Largest water systems in Colorado

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The largest active public water systems in Colorado by population served
#Water systemCountyPopulation servedTypeSource
1Denver Water BoardDenver1,287,000CommunitySurface water
2Aurora City ofArapahoe533,407CommunitySurface water
3Colorado Springs UtilitiesEl Paso464,111CommunitySurface water
4Thornton City ofAdams226,465CommunitySurface water
5Westminster City ofAdams202,078CommunitySurface water
6Ft Collins City ofLarimer179,901CommunitySurface water
7Arvada City ofJefferson171,610CommunitySurface water
8Boulder City ofBoulder166,080CommunitySurface water
9Greeley City ofWeld132,310CommunitySurface water
10Pueblo Board of WwPueblo114,070CommunitySurface water
11Castle Rock Town ofDouglas110,298CommunitySurface water
12Broomfield City and County ofBroomfield106,153CommunitySurface water
13Longmont City ofBoulder104,178CommunitySurface water
14Highlands Ranch WsdDouglas103,444CommunitySurface water
15Ute WcdMesa92,580CommunitySurface water
16Loveland City ofLarimer91,077CommunitySurface water
17Consolidated Mutual Maple GroveJefferson81,400CommunitySurface water
18Parker WsdDouglas75,949CommunitySurface water
19South Adams County WsdAdams75,559CommunityPurchased surface water
20East Cherry Creek Valley WsdArapahoe66,130CommunityPurchased surface water
21Ft Collins Loveland WdLarimer63,532CommunityPurchased surface water
22Englewood City ofArapahoe57,332CommunitySurface water
23Brighton City ofAdams56,304CommunityPurchased surface water
24Southgate WsdArapahoe55,000CommunityPurchased surface water
25Eagle River WsdEagle51,515CommunitySurface water

By county

El Paso135 systemsLarimer134 systemsJefferson112 systemsLa Plata108 systemsGarfield83 systemsAdams82 systemsBoulder81 systemsGrand77 systemsPark76 systemsWeld75 systemsDouglas74 systemsGunnison71 systemsChaffee68 systemsRoutt51 systemsTeller51 systemsPitkin49 systemsRio Grande48 systemsEagle46 systemsDelta42 systemsSummit42 systemsArapahoe39 systemsClear Creek32 systemsFremont31 systemsMesa30 systemsElbert28 systemsPueblo27 systemsConejos25 systemsMontrose25 systemsOtero23 systemsGilpin20 systemsSan Miguel20 systemsLake19 systemsLas Animas18 systemsAlamosa17 systemsCuster17 systemsMontezuma17 systemsArchuleta16 systemsMoffat16 systemsSaguache16 systemsHinsdale14 systemsMineral14 systemsHuerfano13 systemsJackson13 systemsLogan13 systemsCostilla12 systemsYuma11 systemsProwers10 systemsMorgan9 systemsOuray9 systemsRio Blanco9 systemsCrowley8 systemsHarris8 systemsKit Carson7 systemsBaca6 systemsDolores6 systemsLincoln6 systemsWashington6 systemsBent5 systemsDenver4 systemsKiowa4 systemsPhillips4 systemsSan Juan4 systemsSedgwick4 systemsBroomfield3 systemsCheyenne3 systems
Richland Parish2 systems
Clinton2 systems
Genesee2 systems
Oakland2 systems
Brazoria2 systems
Dallam2 systems
Gillespie2 systems
Midland2 systems
Montgomery2 systems
Coconino1 systems
Butte1 systems
Fresno1 systems
Kern1 systems
Fayette1 systems
Long1 systems
Bonner1 systems
Kankakee1 systems
LaSalle1 systems
Lee1 systems
Emmet1 systems
Berrien1 systems
Ingham1 systems
Leelanau1 systems
Livingston1 systems
St. Clair1 systems
Barry1 systems
Newaygo1 systems
Ottawa1 systems
Charlevoix1 systems
Benzie1 systems
Montcalm1 systems
Hubbard1 systems
Otter Tail1 systems
Union1 systems
Blair1 systems
Bexar1 systems
Brazos1 systems
Burnet1 systems
Denton1 systems
Hartley1 systems
Kerr1 systems
Parker1 systems
Reeves1 systems
Sherman1 systems
Tarrant1 systems
Cache1 systems
Uintah1 systems
Laramie1 systems