- EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
- Lithium: found in 34 of 36 samples, average 20.9 µg/L, highest 35.6 µg/L (EPA UCMR 5 testing, Aug 2023–Jan 2025)
- PFHxS (a PFAS): found in 5 of 36 samples, average 2.2 ppt, highest 54.1 ppt (EPA UCMR 5 testing, Aug 2023–Jan 2025)
- PFOS (a PFAS): found in 2 of 36 samples, average 1.7 ppt, highest 52.2 ppt (EPA UCMR 5 testing, Aug 2023–Jan 2025)
- PFHxA (a PFAS): found in 1 of 36 samples, average 0.20 ppt, highest 7.3 ppt (EPA UCMR 5 testing, Aug 2023–Jan 2025)
- PFPeS (a PFAS): found in 1 of 36 samples, average 0.10 ppt, highest 5.3 ppt (EPA UCMR 5 testing, Aug 2023–Jan 2025)
- PFBS (a PFAS): found in 1 of 36 samples, average 0.10 ppt, highest 4.4 ppt (EPA UCMR 5 testing, Aug 2023–Jan 2025)
- Lead, 90th percentile: 3.2 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2021–Dec 31, 2023). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Public EPA test results
Can you drink Moses Lake tap water? What EPA records show
EPA WA5356300 · serves Grant County, WA · about 32,428 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
Moses Lake City of (EPA WA5356300)
EPA data as of October 14, 2026. For Moses Lake's main utility, Moses Lake City of: We found no health-based violations in EPA's records for this system (WA5356300) since July 1, 2021, as of October 14, 2026. EPA's UCMR 5 testing looked for 30 contaminants here and found 6. This is public data, not a test of your tap.
What EPA records show for Moses Lake City of, as of October 14, 2026
We found no health-based violations in EPA's records for this system (WA5356300) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Moses Lake City of (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 3.2 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2021–Dec 31, 2023). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Moses Lake City of use chloramine?
We didn't find chloramine in Moses Lake City of's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.