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Tap water quality report

Epcor - Tierra Del Rio

EPA monitoring tested this supplier for 101 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

101
contaminants tested
12
detected
4,868
people served
2
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
Water source
Ground water
Ownership
Local government
Counties served
Maricopa

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.

2
health-based violations
5
violations on file
2
still open
ViolationTypeStatusPeriod
TT Health-based Unaddressed 2025-09-17
TT Health-based Unaddressed 2025-09-17
Other Monitoring Resolved 2012-07-01
Other Monitoring Resolved 2009-07-01
Other Monitoring Resolved 2008-07-01

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
Copper
180 µg/L 14%
of the EPA limit 1300 µg/L
 40/40 SYR4 2012–2018
Nitrate
600 µg/L 6%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
TTHM
10.7 µg/L 13%
of the EPA limit 80 µg/L
 14/14 SYR4 2012–2019
Lead
21 µg/L 140%
of the EPA limit, in the worst sample — 15 µg/L
 13/40 SYR4 2012–2018
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 9/9 LCR 2024
Arsenic
4.5 µg/L 45%
of the EPA limit 10 µg/L
 3/3 SYR4 2012–2018
Barium
68 µg/L 3.4%
of the EPA limit 2000 µg/L
 3/3 SYR4 2012–2018
Fluoride
300 µg/L 7.5%
of the EPA limit 4000 µg/L
 3/3 SYR4 2012–2018
Lithium
26.7 µg/L
No EPA limit set
 2/2 UCMR-5 2023
Combined Radium (-226 And -228)
0.4000 pCi/L 8%
of the EPA limit 5 pCi/L
 1/3 SYR4 2012–2018
Nitrate-Nitrite
600 µg/L 6%
of the EPA limit 10000 µg/L
 1/1 SYR4 2012
Total Haloacetic Acids (HAA5)
2.8 µg/L 4.7%
of the EPA limit 60 µg/L
 1/14 SYR4 2012–2019
89 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 TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, 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 - Tierra Del Rio

Is Epcor - Tierra Del Rio tap water safe to drink?

EPA monitoring detected 12 contaminants in Epcor - Tierra Del Rio'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 - Tierra Del Rio's water?

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

How many people does Epcor - Tierra Del Rio serve?

Epcor - Tierra Del Rio reports serving 4,868 people in Arizona, per its EPA record.

Has Epcor - Tierra Del Rio had any water quality violations?

The EPA has 5 violations on file for Epcor - Tierra Del Rio, of which 2 are health-based (a contaminant limit or required treatment was breached) and 2 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.