Skip to main content
WaterSafeCheck
Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory

Colorado Drinking Water Quality & Testing Directory

Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 658 ZIP codes across Colorado

Quick Summary: Is Tap Water Safe in Colorado?

Drinking water in Colorado receives an average composite safety score of 59.9/100 based on EPA Safe Drinking Water Act records. Approximately 0% of monitored ZIP codes earn an "A" grade. Water sources are 74.8% surface water and 25.200000000000003% groundwater, resulting in Moderately Soft to Moderate mineral hardness across the state.

Total ZIP Codes

658

Health Violations (5yr)

671

Statewide Avg Score

59.9/100

High Lead Risk Areas

38.8%

Overview: Drinking Water in Colorado

Drinking water quality in Colorado averages a composite safety score of 59.9/100 across its 658 monitored ZIP codes. Approximately 0% of ZIP codes in the state receive an "A" grade, while 1% receive an "F" grade. Environmental standards are enforced by Colorado Department of Public Health and Environment.

Surface Water

74.8%

of ZIP codes

Total Violations

4,570

5-year record

Grade A ZIPs

0

0% of state

Grade F ZIPs

9

1% of state

Water Quality Grade Distribution in Colorado

How do Colorado's 658 ZIP codes stack up by water quality grade?

A
0 ZIP codes0%
B
57 ZIP codes9%
C
426 ZIP codes65%
D
166 ZIP codes25%
F
9 ZIP codes1%

Popular Cities in Colorado

Click any city to view ZIP code-level water quality reports

Denver

69 ZIPs

C

Colorado Springs

55 ZIPs

C

Aurora

17 ZIPs

D

Littleton

16 ZIPs

C

Boulder

16 ZIPs

C

Pueblo

12 ZIPs

C

Fort Collins

9 ZIPs

C

Arvada

7 ZIPs

C

Englewood

7 ZIPs

C

Grand Junction

7 ZIPs

C

Greeley

6 ZIPs

C

Broomfield

4 ZIPs

C

Westminster

4 ZIPs

C

Golden

4 ZIPs

C

Longmont

4 ZIPs

C

Castle Rock

3 ZIPs

C

Steamboat Springs

3 ZIPs

C

Loveland

3 ZIPs

D

Brighton

3 ZIPs

C

Gunnison

3 ZIPs

C

Durango

3 ZIPs

C

Montrose

3 ZIPs

C

Commerce City

2 ZIPs

C

Louisville

2 ZIPs

C

Wheat Ridge

2 ZIPs

D

Parker

2 ZIPs

C

Evergreen

2 ZIPs

D

Silverthorne

2 ZIPs

C

Estes Park

2 ZIPs

C

Windsor

2 ZIPs

C

Woodland Park

2 ZIPs

C

Limon

2 ZIPs

C

U S A F Academy

2 ZIPs

D

Crowley

2 ZIPs

D

Alamosa

2 ZIPs

B

Pagosa Springs

2 ZIPs

B

Canon City

2 ZIPs

C

Crested Butte

2 ZIPs

C

Florence

2 ZIPs

C

Glenwood Springs

2 ZIPs

C

City A-Z Directory — Colorado

Browse water quality reports for every town and city in Colorado.

A
AgateAguilarAkronAlamosaAllensparkAlmaAlmontAmherstAntonAntonitoArapahoeArbolesArlingtonArribaArvadaAspenAtwoodAultAuroraAustinAvonAvondale
B
BaileyBasaltBattlement MesaBayfieldBedrockBellvueBennettBerthoudBethuneBeulahBlack HawkBlancaBoncarboBondBooneBoulderBransonBreckenridgeBriggsdaleBrightonBroomfieldBrushBuena VistaBuffalo CreekBurlingtonBurnsByers
C
CahoneCalhanCampoCanon CityCapulinCarbondaleCarrCascadeCastle RockCedaredgeCenterCentral CityChamaCherawCheyenne WellsChromoCimarronClarkCliftonClimaxCoal CreekCoaldaleCoalmontCollbranColorado CityColorado SpringsCommerce CityComoConejosConiferCopeCortezCoryCotopaxiCowdreyCraigCrawfordCreedeCrested ButteCrestoneCripple CreekCrookCrowley
D
DaconoDe BequeDeer TrailDel NorteDeltaDenverDillonDinosaurDivideDoloresDove CreekDrakeDumontDupontDurango
E
EadsEagleEastlakeEatonEckertEckleyEdwardsEgnarElbertEldorado SpringsElizabethEmpireEnglewoodErieEstes ParkEvansEvergreen
F
FairplayFirestoneFlaglerFlemingFlorenceFlorissantFort CollinsFort GarlandFort LuptonFort LyonFort MorganFountainFowlerFranktownFraserFrederickFriscoFruita
G
GaletonGarciaGardnerGatewayGenoaGeorgetownGilcrestGillGlade ParkGlen HavenGlenwood SpringsGoldenGranadaGranbyGrand JunctionGrand LakeGraniteGrantGreeleyGreen Mountain FallsGroverGuffeyGunnisonGypsum
H
HamiltonHartmanHartselHastyHaswellHaxtunHaydenHendersonHerefordHesperusHillroseHillsideHoehneHollyHolyokeHomelakeHooperHot Sulphur SpringsHotchkissHowardHudsonHugoHygiene
I
Idaho SpringsIdaliaIdledaleIgnacioIliffIndian Hills
J
JamestownJarosoJeffersonJoesJohnstownJulesburg
K
KarvalKeenesburgKerseyKimKiowaKirkKit CarsonKittredgeKremmling
L
La JaraLa JuntaLa SalleLa VetaLafayetteLake CityLake GeorgeLamarLaporteLarkspurLas AnimasLazearLeadvilleLewisLimonLindonLittletonLivermoreLog Lane VillageLomaLone TreeLongmontLouisvilleLouviersLovelandLucerneLyons
M
MackManassaMancosManitou SpringsManzanolaMarvelMasonvilleMathesonMaybellMc ClaveMc CoyMeadMeekerMeredithMerinoMesaMesa Verde National ParkMillikenMinturnModelMoffatMolinaMonarchMonte VistaMontroseMonumentMorrisonMosca
N
NathropNaturitaNederlandNew CastleNew RaymerNiwotNorwoodNuclaNunn
O
Oak CreekOhio CityOlatheOlney SpringsOphirOrchardOrdwayOtisOurayOvid
P
PadroniPagosa SpringsPalisadePalmer LakePaoliPaoniaParachuteParadoxParkerParlinParshallPeetzPenrosePeytonPhippsburgPiercePinePinecliffePitkinPlacervillePlattevillePleasant ViewPoncha SpringsPowderhornPritchettPueblo
R
RamahRandRangelyRed CliffRed Feather LakesRedvaleRicoRidgwayRifleRockvaleRocky FordRoggenRollinsvilleRomeoRushRye
S
SaguacheSalidaSan LuisSanfordSargentsSedaliaSedgwickSeibertSeveranceShawneeSheridan LakeSiltSilver PlumeSilverthorneSilvertonSimlaSlaterSnowmassSnowmass VillageSnyderSomersetSouth ForkSpringfieldSteamboat SpringsSterlingStonehamStrasburgStrattonSugar CitySwink
T
TabernashTellurideThorntonTimnathToponasTowaocTrincheraTrinidadTwin LakesTwo Buttes
U
U S A F Academy
V
VailVernonVictorVilasVilla GroveVona
W
WaldenWalsenburgWalshWardWatkinsWeldonaWellingtonWestcliffeWestminsterWestonWetmoreWheat RidgeWhitewaterWigginsWild HorseWileyWindsorWinter ParkWolcottWoodland ParkWoodrowWoody CreekWray
Y
YampaYellow JacketYoderYuma

🏆 Highest Rated ZIP Codes in Colorado

81123Blanca
83/100
B
81128Chromo
83/100
B
81151Sanford
83/100
B
81655Wolcott
83/100
B
81658Vail
83/100
B

⚠ Lowest Rated ZIP Codes in Colorado

80746Paoli
31/100
F
81030Cheraw
33/100
F
81047Holly
33/100
F
81058Manzanola
33/100
F
80536Livermore
34/100
F

Common Drinking Water Contaminants in Colorado

The following are common regulated contaminants found in Colorado drinking water based on EPA violation records. Click any contaminant to learn about EPA safety limits and health effects.

Chlorine residualE. coliContaminant 0700Stage 1 DBP RuleFecal ColiformStage 2 DBP RuleGross BetaHaloacetic Acids (HAA5)

Source: EPA Safe Drinking Water Act Maximum Contaminant Level regulations. For the complete list of regulated contaminants and MCLs, see the Water Quality Safety Guide.

Frequently Asked Questions — Colorado Drinking Water

Is tap water generally safe to drink in Colorado?+
Yes, for the majority of residents, tap water in Colorado is treated and regulated. However, compliance varies by city. State-wide, 0 ZIP codes receive an "A" grade, while 9 receive an "F". Search your specific ZIP code to see your local utility's record.
How do I test water quality or well water in Colorado?+
Residents in Colorado can test their tap or well water by contacting laboratories certified by Colorado Department of Public Health and Environment or ordering an EPA-standard laboratory water testing kit. Annual testing is recommended for private wells to test for bacteria, nitrates, and heavy metals.
What are the biggest water quality issues in Colorado?+
The primary issues include managing 671 health-based violations state-wide and resolving infrastructure age. 38.8% of ZIP codes in the state have a high probability of lead exposure risk due to pre-1986 piping.
Who regulates and enforces drinking water standards in Colorado?+
Drinking water in Colorado is regulated by Colorado Department of Public Health and Environment under a primacy agreement with the U.S. EPA.
Where does Colorado get its drinking water?+
Approximately 74.8% of monitored areas in Colorado rely on surface water sources (lakes/rivers), while the rest use groundwater aquifers.
How do I find the official water quality report for my home in Colorado?+
Search your ZIP code on our site to view data compiled from EPA records, or contact your local utility for their annual Consumer Confidence Report (CCR).
View All 658 ZIP Codes in Colorado

Browse EPA water quality data for every monitored ZIP code. For faster results, use the search bar above.

80001800028000380004800058000680007800108001180012800138001480015800168001780018800198002080021800228002380024800258002680027800288003080031800338003480035800368003780038800408004180042800448004580046800478010180102801038010480105801068010780108801098011080111801128011380116801178011880120801218012280123801248012580126801278012880129801308013180132801338013480135801368013780138801508015180155801608016180162801638016580166802018020280203802048020580206802078020880209802108021180212802148021580216802178021880219802208022180222802238022480225802268022780228802298023080231802328023380234802358023680237802388023980241802438024480246802478024880249802508025180252802568025780259802608026180262802638026480265802668027180273802748027980280802818029080291802938029480295802998030180302803038030480305803068030780308803098031080314803218032280323803288032980401804028040380419804208042180422804238042480425804268042780428804298043080432804338043480435804368043780438804398044080442804438044480446804478044880449804518045280453804548045580456804578045980461804638046580466804678046880469804708047180473804748047580476804778047880479804808048180482804838048780488804978049880501805028050380504805108051180512805138051480515805168051780520805218052280523805248052580526805278052880530805328053380534805358053680537805388053980540805418054280543805448054580546805478054980550805518055380601806028060380610806118061280614806158062080621806228062380624806318063280633806348063880639806408064280643806448064580646806488064980650806518065280653806548070180705807208072180722807238072680727807288072980731807328073380734807358073680737807408074180742807438074480745807468074780749807508075180754807558075780758807598080180802808048080580807808088080980810808128081380814808158081680817808188081980820808218082280823808248082580826808278082880829808308083180832808338083480835808368084080841808608086180862808638086480866809018090280903809048090580906809078090880909809108091180912809138091480915809168091780918809198092080921809228092380924809258092680927809288092980930809318093280933809348093580936809378093880939809418094280943809448094580946809478094980950809518096080962809708097780995809978100181002810038100481005810068100781008810098101081011810128101981020810218102281023810248102581027810298103081033810348103681038810398104081041810438104481045810468104781049810508105281054810558105781058810598106281063810648106781069810718107381076810778108181082810848108781089810908109181092811018110281120811218112281123811248112581126811288112981130811318113281133811348113581136811378113881140811418114381144811468114781148811498115181152811548115581157812018121081211812128121581220812218122281223812248122581226812278122881230812318123281233812358123681237812398124081241812428124381244812478124881251812528125381290813018130281303813208132181323813248132581326813278132881329813308133181332813348133581401814028140381410814118141381414814158141681418814198142081422814238142481425814268142781428814298143081431814328143381434814358150181502815038150481505815068150781520815218152281523815248152581526815278160181602816108161181612816158162081621816238162481625816268163081631816328163381635816368163781638816398164081641816428164381645816468164781648816498165081652816538165481655816568165781658

All 658 ZIP codes in Colorado are actively monitored under the EPA Safe Drinking Water Act.