MyCleanWater

Nogales, Arizona Water Quality Report

Water quality data for 5 water systems serving 22,842 people.

45
Poor
out of 100

Water Source

5
Water Systems
23K
People Served
Ground water
Water Source

Detected Contaminants

ContaminantDetected LevelEPA Limit (MCL)Health Guideline% of LimitStatus
lithium57.4 No federal limit10.0 ug/L(EPA/USGS HBSL)
574%
Above guideline

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Compliance & Violations

Active Violations (30)

75

Dec 20, 2024

minor

2E

Oct 17, 2024

critical

4G

Oct 17, 2024

minor

2E

Oct 17, 2024

critical

4G

Oct 17, 2024

minor

2E

Oct 17, 2024

critical

4G

Oct 17, 2024

minor

2E

Oct 17, 2024

critical

2E

Oct 17, 2024

critical

2E

Oct 17, 2024

critical

4G

Oct 17, 2024

minor

4G

Oct 17, 2024

minor

2E

Oct 17, 2024

critical

2E

Oct 17, 2024

critical

2E

Oct 17, 2024

critical

2E

Oct 17, 2024

critical

4G

Oct 17, 2024

minor

2E

Oct 17, 2024

critical

4G

Oct 17, 2024

minor

4G

Oct 17, 2024

minor

4G

Oct 17, 2024

minor

2E

Oct 17, 2024

critical

4G

Oct 17, 2024

minor

4G

Oct 17, 2024

minor

4G

Oct 17, 2024

minor

4G

Oct 17, 2024

minor

2E

Oct 17, 2024

critical

34

Dec 1, 2022

moderate

34

Dec 1, 2022

moderate

34

Dec 1, 2022

moderate

Resolved Violations (470)

27

Jul 1, 2025 — Jul 31, 2025

moderate

27

Jul 1, 2025 — Jul 31, 2025

moderate

27

Jul 1, 2025 — Jul 31, 2025

moderate

27

Jul 1, 2025 — Jul 31, 2025

moderate

75

Jun 27, 2025

minor

+ 465 more resolved violations

Frequently Asked Questions

Is Nogales tap water safe to drink?

Nogales's water meets all EPA maximum contaminant levels. However, 1 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.

What contaminants are in Nogales tap water?

1 contaminants have been detected in Nogales's water supply across 5 water systems. See the full contaminant table above for details.

How can I improve my water quality in Nogales?

Install a water filter rated for the specific contaminants found in Nogales's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.

Does Nogales have any water quality violations?

Yes, Nogales currently has 91 active violations. See the violations section above for details.