Issaquah, Washington Water Quality Report
Water quality data for 4 water systems serving 43,739 people.
Water Source
Detected Contaminants
No contaminant data available for this location.
Get a Free Water Quality Consultation
Connect with a certified water treatment professional in Issaquah, Washington.
Get Water Quality Alerts
Be the first to know when water quality changes in Issaquah.
Compliance & Violations
Active Violations (3)
52
Jan 1, 2022
71
Jul 1, 2019
71
Jul 1, 2018
Resolved Violations (497)
71
Jul 1, 2024
03
Jan 1, 2024 — Dec 31, 2024
03
Jan 1, 2023 — Dec 31, 2023
3A
May 1, 2020 — May 31, 2020
3A
Apr 1, 2020 — Apr 30, 2020
+ 492 more resolved violations
Frequently Asked Questions
Is Issaquah tap water safe to drink?
Issaquah'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 Issaquah tap water?
0 contaminants have been detected in Issaquah's water supply across 4 water systems. See the full contaminant table above for details.
How can I improve my water quality in Issaquah?
Install a water filter rated for the specific contaminants found in Issaquah's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Issaquah have any water quality violations?
Yes, Issaquah currently has 28 active violations. See the violations section above for details.