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Tap water quality report

Epcor - Willow Valley/King Street

EPA monitoring tested this supplier for 102 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

102
contaminants tested
10
detected
3,408
people served
12
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
Water source
Ground water
Ownership
Private
Counties served
Mohave

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

12
health-based violations
117
violations on file
1
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2025-04-01 → 2025-04-30
MCL Health-based Resolved 2025-04-01 → 2025-04-30
MCL Health-based Resolved 2025-04-01 → 2025-04-30
MCL Health-based Resolved 2025-04-01 → 2025-04-30
MCL Health-based Resolved 2012-01-01 → 2012-03-31
MCL Health-based Resolved 2007-05-01 → 2007-05-31
MCL Health-based Resolved 2006-10-01 → 2006-10-31
MCL Health-based Resolved 2005-08-01 → 2005-08-31
MCL Health-based Resolved 2004-10-01 → 2004-10-31
MCL Health-based Resolved 2004-09-01 → 2004-09-30

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Chlorite
750 µg/L 75%
of the EPA limit 1000 µg/L
 124/274 SYR4 2012–2019
TTHM
93 µg/L 116%
of the EPA limit, in the worst sample — 80 µg/L
 62/62 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
26 µg/L 43%
of the EPA limit 60 µg/L
 62/62 SYR4 2012–2019
Copper
1900 µg/L 146%
of the EPA limit, in the worst sample — 1300 µg/L
 40/40 SYR4 2014–2017
Lead
15 µg/L 100%
of the EPA limit 15 µg/L
 26/40 SYR4 2014–2017
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 8/8 LCR 2023
Lithium
91.3 µg/L
No EPA limit set
 2/2 UCMR-5 2023
Arsenic
1.8 µg/L 18%
of the EPA limit 10 µg/L
 1/1 SYR4 2012
Barium
37 µg/L 1.9%
of the EPA limit 2000 µg/L
 1/1 SYR4 2012
Fluoride
230 µg/L 5.8%
of the EPA limit 4000 µg/L
 1/1 SYR4 2012
92 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DIDOMIZIO, TOM
Phone
623-445-2431
Email
tdidomizio@epcor.com

Frequently asked questions about Epcor - Willow Valley/King Street

Is Epcor - Willow Valley/King Street tap water safe to drink?

EPA monitoring detected 10 contaminants in Epcor - Willow Valley/King Street's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Epcor - Willow Valley/King Street's water?

EPA monitoring detected Chlorite, TTHM, Total Haloacetic Acids (HAA5), Copper, Lead, and others. The full list with the level and data source for each is above.

How many people does Epcor - Willow Valley/King Street serve?

Epcor - Willow Valley/King Street reports serving 3,408 people in Arizona, per its EPA record.

Has Epcor - Willow Valley/King Street had any water quality violations?

The EPA has 117 violations on file for Epcor - Willow Valley/King Street, of which 12 are health-based (a contaminant limit or required treatment was breached) and 1 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.