Is Lago Del Oro Water Company Tap Water Safe? Quality Report

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.

health-based violations

772

violations on file

still open

Violation	Type	Status	Period
MR	Monitoring	Resolved	2025-07-01 → 2025-09-30
MR	Monitoring	Resolved	2025-07-01 → 2025-09-30
MR	Monitoring	Resolved	2025-07-01 → 2025-09-30
MR	Monitoring	Resolved	2025-07-01 → 2025-09-30
MR	Monitoring	Resolved	2025-07-01 → 2025-09-30
MR	Monitoring	Resolved	2025-07-01 → 2025-09-30
MR	Monitoring	Resolved	2025-07-01 → 2025-09-30
MR	Monitoring	Resolved	2025-07-01 → 2025-09-30
MR	Monitoring	Resolved	2025-07-01 → 2025-09-30
MR	Monitoring	Resolved	2025-07-01 → 2025-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfhxa	0.0041 µg/L	2/24	2025
Pfpea	0.0065 µg/L	2/24	2025

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	3970 µg/L 40% of the EPA limit 10000 µg/L worst single sample: 4290 µg/L	176/176	SYR4	2012–2019
Nitrate-Nitrite	3955 µg/L 40% of the EPA limit 10000 µg/L worst single sample: 4290 µg/L	87/87	SYR4	2012–2019
Copper	250 µg/L 19% of the EPA limit 1300 µg/L worst single sample: 358 µg/L	81/90	SYR4	2012–2018
TTHM	13.1 µg/L 16% of the EPA limit 80 µg/L worst single sample: 21.3 µg/L	47/52	SYR4	2012–2019
Lithium	20 µg/L No EPA limit set	13/24	UCMR-5	2025
Total Haloacetic Acids (HAA5)	4.65 µg/L 7.8% of the EPA limit 60 µg/L worst single sample: 5.8 µg/L	11/52	SYR4	2012–2019
Combined Uranium	7.725 µg/L 26% of the EPA limit 30 µg/L worst single sample: 10.2 µg/L	10/11	SYR4	2015
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	10/10	LCR	2024
Lead	3.12 µg/L 21% of the EPA limit 15 µg/L worst single sample: 3.2 µg/L	9/90	SYR4	2012–2018
Gross Alpha, Excl. Radon And U	1.8 pCi/L 12% of the EPA limit 15 pCi/L worst single sample: 1.9 pCi/L	6/11	SYR4	2015
Combined Radium (-226 And -228)	0.9550 pCi/L 19% of the EPA limit 5 pCi/L worst single sample: 1 pCi/L	4/11	SYR4	2015
Arsenic	3.24 µg/L 32% of the EPA limit 10 µg/L worst single sample: 3.3 µg/L	3/3	SYR4	2012–2017
Fluoride	534 µg/L 13% of the EPA limit 4000 µg/L worst single sample: 540 µg/L	3/3	SYR4	2012–2017
Selenium	2.54 µg/L 5.1% of the EPA limit 50 µg/L worst single sample: 2.6 µg/L	3/3	SYR4	2012–2017
Bromodichloromethane	3.165 µg/L No EPA limit set worst single sample: 3.2 µg/L	2/2	SYR4	2019
Bromoform	3.175 µg/L No EPA limit set worst single sample: 3.2 µg/L	2/2	SYR4	2019
Chloroform	0.9950 µg/L No EPA limit set worst single sample: 1 µg/L	2/2	SYR4	2019
Dibromoacetic Acid	2.555 µg/L No EPA limit set worst single sample: 2.6 µg/L	2/2	SYR4	2019
Dibromochloromethane	6.03 µg/L No EPA limit set worst single sample: 6.1 µg/L	2/2	SYR4	2019
Xylenes, Total	0.6000 µg/L 0% of the EPA limit 10000 µg/L	2/24	SYR4	2013–2018
Barium	20 µg/L 1% of the EPA limit 2000 µg/L	1/3	SYR4	2012–2017

90 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) PhthalateDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: LAGO DEL ORO WATER CO
Phone: 520-825-3423
Email: [email protected]

Frequently asked questions about Lago Del Oro Water Company

Is Lago Del Oro Water Company tap water safe to drink?

EPA monitoring detected 23 contaminants in Lago Del Oro Water Company'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 Lago Del Oro Water Company's water?

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

How many people does Lago Del Oro Water Company serve?

Lago Del Oro Water Company reports serving 18,132 people in Arizona, per its EPA record.

Has Lago Del Oro Water Company had any water quality violations?

The EPA has 772 violations on file for Lago Del Oro Water Company, of which 0 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.