- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- PFBS (a PFAS): found in 2 of 10 samples, average 1.3 ppt, highest 6.8 ppt (EPA UCMR 5 testing, May 2023–Oct 2023)
Public EPA test results
Can you drink Tumwater tap water? What EPA records show
EPA WA5389700 · serves Thurston County, WA · about 51,924 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
Tumwater City of (EPA WA5389700)
EPA data as of October 14, 2026. For Tumwater's main utility, Tumwater City of: We found no health-based violations in EPA's records for this system (WA5389700) since July 1, 2021, as of October 14, 2026. PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
What EPA records show for Tumwater City of, as of October 14, 2026
We found no health-based violations in EPA's records for this system (WA5389700) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Tumwater City of (SDWIS). Data as of October 14, 2026.
This system buys water from Olympia City of (WA5363450); see that system's records.
Source: Olympia City of (WA5363450) report. Data as of October 14, 2026.
EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
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 Tumwater City of use chloramine?
We didn't find chloramine in Tumwater City of's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.