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Tap water quality report

Epcor - San Tan

EPA monitoring tested this supplier for 103 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

103
contaminants tested
16
detected
87,435
people served
13
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
Water source
Ground water
Ownership
Private
Counties served
Pinal

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.

13
health-based violations
380
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2017-01-01 → 2017-12-31
MCL Health-based Resolved 2017-01-01 → 2017-12-31
MCL Health-based Resolved 2017-01-01 → 2017-12-31
MCL Health-based Resolved 2016-01-01 → 2016-12-31
MCL Health-based Resolved 2016-01-01 → 2016-12-31
MCL Health-based Resolved 2016-01-01 → 2016-12-31
MCL Health-based Resolved 2012-08-01 → 2012-08-31
MCL Health-based Resolved 2012-08-01 → 2012-08-31
MCL Health-based Resolved 2012-08-01 → 2012-08-31
MCL Health-based Resolved 2012-01-01 → 2012-12-31

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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
10200 µg/L 102%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 16000 µg/L
218/218 SYR4 2012–2019
Copper
117 µg/L 9%
of the EPA limit 1300 µg/L
worst single sample: 168 µg/L
84/90 SYR4 2012–2018
TTHM
11.2 µg/L 14%
of the EPA limit 80 µg/L
worst single sample: 34.7 µg/L
81/115 SYR4 2012–2019
Nitrate-Nitrite
9760 µg/L 98%
of the EPA limit 10000 µg/L
worst single sample: 11400 µg/L
53/53 SYR4 2013–2019
Arsenic
6.8 µg/L 68%
of the EPA limit 10 µg/L
worst single sample: 9.6 µg/L
21/22 SYR4 2012–2018
Chromium
6.8 µg/L 6.8%
of the EPA limit 100 µg/L
worst single sample: 8.6 µg/L
21/21 SYR4 2012–2018
Fluoride
1300 µg/L 33%
of the EPA limit 4000 µg/L
worst single sample: 1700 µg/L
21/21 SYR4 2012–2018
Barium
56 µg/L 2.8%
of the EPA limit 2000 µg/L
worst single sample: 170 µg/L
20/21 SYR4 2012–2018
Total Haloacetic Acids (HAA5)
4.34 µg/L 7.2%
of the EPA limit 60 µg/L
worst single sample: 4.9 µg/L
15/112 SYR4 2012–2019
Lithium
185 µg/L
No EPA limit set
 14/14 UCMR-5 2025
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 10/10 LCR 2024
Combined Radium (-226 And -228)
4.875 pCi/L 98%
of the EPA limit 5 pCi/L
worst single sample: 5.1 pCi/L
6/14 SYR4 2012–2018
Combined Uranium
9.805 µg/L 33%
of the EPA limit 30 µg/L
worst single sample: 10 µg/L
4/4 SYR4 2015–2016
Gross Alpha, Excl. Radon And U
6.475 pCi/L 43%
of the EPA limit 15 pCi/L
worst single sample: 6.7 pCi/L
4/4 SYR4 2015–2016
Lead
7.52 µg/L 50%
of the EPA limit 15 µg/L
worst single sample: 7.9 µg/L
3/90 SYR4 2012–2018
Selenium
8 µg/L 16%
of the EPA limit 50 µg/L
worst single sample: 8.1 µg/L
2/21 SYR4 2012–2018
87 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 TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HOSKIN, JULIE
Phone
602-722-4100
Email
[email protected]

Frequently asked questions about Epcor - San Tan

Is Epcor - San Tan tap water safe to drink?

EPA monitoring detected 16 contaminants in Epcor - San Tan'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 - San Tan's water?

EPA monitoring detected Nitrate, Copper, TTHM, Nitrate-Nitrite, Arsenic, and others. The full list with the level and data source for each is above.

How many people does Epcor - San Tan serve?

Epcor - San Tan reports serving 87,435 people in Arizona, per its EPA record.

Has Epcor - San Tan had any water quality violations?

The EPA has 380 violations on file for Epcor - San Tan, of which 13 are health-based (a contaminant limit or required treatment was breached) and 0 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.