Seattle, Washington Water Quality Report
Water quality data for 14 water systems serving 1,161,344 people.
Water Source
Detected Contaminants
No contaminant data available for this location.
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Compliance & Violations
Active Violations (169)
75
Aug 23, 2025
71
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
75
Apr 4, 2025
75
Apr 4, 2025
75
Jan 1, 2025
75
Dec 8, 2024
72
Dec 5, 2024
34
Dec 3, 2024
72
Oct 1, 2024
72
Oct 1, 2024
75
Jul 22, 2024
75
Jul 22, 2024
75
Jul 22, 2024
75
Jul 22, 2024
75
Jul 22, 2024
75
Jul 22, 2024
71
Jul 1, 2024
71
Jul 1, 2024
75
Jun 25, 2024
75
Jun 25, 2024
75
Jun 25, 2024
75
Jun 25, 2024
75
Jun 25, 2024
75
Jun 25, 2024
52
Jun 1, 2024
52
Jun 1, 2024
52
Jun 1, 2024
75
May 26, 2024
75
May 26, 2024
75
May 26, 2024
75
May 26, 2024
75
May 26, 2024
75
May 26, 2024
75
Apr 22, 2024
75
Apr 22, 2024
75
Apr 22, 2024
75
Apr 22, 2024
75
Apr 22, 2024
75
Apr 22, 2024
75
Apr 7, 2024
75
Apr 7, 2024
75
Apr 7, 2024
75
Mar 26, 2024
75
Mar 26, 2024
75
Mar 26, 2024
75
Feb 20, 2024
75
Feb 20, 2024
75
Feb 20, 2024
75
Feb 20, 2024
75
Feb 20, 2024
75
Feb 20, 2024
75
Jan 22, 2024
75
Jan 22, 2024
75
Jan 22, 2024
75
Jan 22, 2024
75
Jan 22, 2024
75
Jan 22, 2024
75
Dec 25, 2023
75
Dec 25, 2023
75
Dec 25, 2023
75
Dec 25, 2023
75
Dec 25, 2023
75
Dec 25, 2023
75
Nov 28, 2023
75
Nov 28, 2023
75
Nov 28, 2023
75
Nov 28, 2023
75
Nov 28, 2023
75
Nov 28, 2023
75
Oct 24, 2023
75
Oct 24, 2023
75
Oct 24, 2023
75
Oct 24, 2023
75
Oct 24, 2023
75
Oct 24, 2023
72
Oct 1, 2023
72
Oct 1, 2023
75
Sep 26, 2023
75
Sep 26, 2023
75
Sep 26, 2023
75
Sep 26, 2023
75
Sep 26, 2023
75
Sep 26, 2023
75
Aug 22, 2023
75
Aug 22, 2023
75
Aug 22, 2023
75
Aug 22, 2023
75
Aug 22, 2023
75
Aug 22, 2023
75
Jul 24, 2023
75
Jul 24, 2023
75
Jul 24, 2023
75
Jul 24, 2023
75
Jul 24, 2023
75
Jul 24, 2023
75
Jul 3, 2023
75
Jul 3, 2023
75
Jul 3, 2023
71
Jul 1, 2023
71
Jul 1, 2023
71
Jul 1, 2023
71
Jul 1, 2023
75
Jun 20, 2023
75
Jun 20, 2023
75
Jun 20, 2023
75
May 21, 2023
75
May 21, 2023
75
May 21, 2023
75
Apr 24, 2023
75
Apr 24, 2023
75
Apr 24, 2023
75
Apr 24, 2023
75
Apr 24, 2023
75
Apr 24, 2023
75
Apr 1, 2023
75
Apr 1, 2023
75
Apr 1, 2023
75
Feb 21, 2023
75
Feb 21, 2023
75
Feb 21, 2023
75
Jan 31, 2023
75
Jan 31, 2023
75
Jan 31, 2023
75
Jan 31, 2023
75
Dec 20, 2022
75
Dec 20, 2022
75
Dec 20, 2022
75
Dec 20, 2022
75
Nov 22, 2022
75
Nov 22, 2022
75
Nov 22, 2022
75
Nov 22, 2022
75
Nov 22, 2022
75
Nov 22, 2022
75
Nov 22, 2022
75
Nov 22, 2022
75
Oct 25, 2022
75
Oct 25, 2022
75
Oct 25, 2022
75
Oct 25, 2022
75
Sep 20, 2022
75
Sep 20, 2022
75
Sep 20, 2022
75
Sep 20, 2022
34
Sep 20, 2022
34
Sep 20, 2022
34
Sep 20, 2022
34
Sep 20, 2022
34
Sep 20, 2022
75
Sep 20, 2022
75
Sep 20, 2022
75
Sep 20, 2022
75
Sep 20, 2022
75
Aug 23, 2022
75
Aug 23, 2022
75
Aug 23, 2022
75
Aug 23, 2022
75
Aug 23, 2022
75
Aug 23, 2022
75
Aug 23, 2022
75
Aug 23, 2022
71
Jul 1, 2022
71
Jul 1, 2022
71
Jul 1, 2022
52
Jun 1, 2021
52
Jun 1, 2021
52
Jun 1, 2021
Resolved Violations (331)
3A
Sep 1, 2025 — Sep 30, 2025
01
Sep 1, 2025 — Sep 30, 2025
03
Sep 1, 2025 — Sep 30, 2025
3A
Aug 1, 2025 — Aug 31, 2025
3A
Aug 1, 2025 — Aug 31, 2025
+ 326 more resolved violations
Frequently Asked Questions
Is Seattle tap water safe to drink?
Seattle's water meets all EPA maximum contaminant levels. However, 0 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Seattle tap water?
0 contaminants have been detected in Seattle's water supply across 14 water systems. See the full contaminant table above for details.
How can I improve my water quality in Seattle?
Install a water filter rated for the specific contaminants found in Seattle's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Seattle have any water quality violations?
Yes, Seattle currently has 326 active violations. See the violations section above for details.