Nampa, Idaho Water Quality Report
Water quality data for 53 water systems serving 104,969 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 42.1 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 421% | Above guideline |
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Compliance & Violations
Active Violations (47)
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
75
Mar 3, 2025
75
Mar 3, 2025
75
Jan 3, 2025
75
Jan 3, 2025
66
Dec 30, 2024
66
Dec 30, 2024
75
Nov 26, 2024
75
Nov 26, 2024
20
Nov 25, 2024
20
Nov 25, 2024
52
Oct 1, 2024
52
Oct 1, 2024
34
Apr 3, 2024
34
Apr 3, 2024
34
Jan 12, 2024
34
Jan 12, 2024
66
Dec 30, 2023
66
Dec 30, 2023
75
Sep 22, 2023
75
Sep 22, 2023
20
Apr 27, 2023
20
Apr 27, 2023
34
Apr 20, 2023
34
Apr 20, 2023
66
Dec 30, 2022
66
Dec 30, 2022
66
Dec 30, 2021
66
Dec 30, 2021
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Resolved Violations (537)
3A
Aug 1, 2025 — Aug 31, 2025
34
Jul 17, 2025
34
Jul 17, 2025
34
Jul 17, 2025
3A
Jul 1, 2025 — Jul 31, 2025
+ 532 more resolved violations
Frequently Asked Questions
Is Nampa tap water safe to drink?
Nampa'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 Nampa tap water?
1 contaminants have been detected in Nampa's water supply across 53 water systems. See the full contaminant table above for details.
How can I improve my water quality in Nampa?
Install a water filter rated for the specific contaminants found in Nampa's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Nampa have any water quality violations?
Yes, Nampa currently has 140 active violations. See the violations section above for details.