Drinking water quality · 2024
· Verified
· PWSID WA5386800
What's in Tacoma, WA tap water
Every one of the 12 core regulated contaminants reported for Tacoma, WA came in below its federal limit.
- !12 of 27 core regulated contaminants reported — 15 never appear in this report
- ✓Nothing over a federal limit
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −0 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −0 health-based violations resolved in the last 5 years
- −11 core regulated contaminants never reported (12/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →+15 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| PFHxS (Perfluorohexane sulfonic acid) | 5.1000000000000005 ng/L | 10 ng/L |
| Nitrate | 4.26 mg/L | 10 mg/L |
| Chlorine | 0.3–1.46 mg/L | 4 mg/L |
| Trichloroethylene | 1.4 ug/L | 5 ug/L |
| Fluoride | 0.96 mg/L | 4 mg/L |
| Arsenic | 1.7 ug/L | 10 ug/L |
| TTHM | 13.2 ug/L | 80 ug/L |
| Turbidity | 0.034 NTU | 1 NTU |
| HAA5 | 1.9 ug/L | 60 ug/L |
| Bromate | 0 mg/L | 0.01 mg/L |
| Chloroform | 0.72 ug/L | — |
| Copper | 0 mg/L | 1.3 mg/L |
| Lead | Not detected % | — |
| Total Coliform | 0.04 % | 0 % |
| PFBS | 3.3 ng/L | — |
What this report doesn't tell you
15 of the 27 contaminants a community water system normally reports do not appear anywhere in Tacoma, WA's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
PFAS — EPA UCMR5 (2023–2025)
2 PFAS compounds detected in Tacoma, WA
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
PFHxS (Perfluorohexane sulfonic acid)
● Below limitPFBS
● Detected (no federal limit)Where your water comes from · EPA SDWIS
Tacoma, WA's drinking water comes from ground water, drawn from 34 sources.
Source
- U.P. NO. 1 ABM926
- GPL NO. 1 ACN710
- GPL NO. 2 ACN709
- 1-B
- + 30 more
Treatment
- Green River WTP
- South Tacoma Pump Station
- Hood Street Reservoir
- + 5 more
Distribution
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Treatment technique violationHealth-based8 violations on record · most recent Nov 2014resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗