Is Tap Water Safe to Drink in Tacoma?
Yes, tap water in Tacoma is safe to drink and among the softest, cleanest big-city supplies in the country. Most of it flows from the protected Green River watershed in the Cascades, filtered since 2015 and fully EPA-compliant.
Water Source
Tacoma Water, part of Tacoma Public Utilities, draws primarily from the Green River in a restricted-access Cascade watershed, treated at a filtration facility completed in 2015, supplemented by the North Fork wells and South Tacoma groundwater.
EPA Compliance Status
Meets all federal Safe Drinking Water Act standards.
Notable Contaminants & Context
- •No significant source-water concerns; the Green River watershed is closed to public access and heavily protected
- •Naturally very soft, low-alkalinity water can be slightly corrosive, so treatment adjusts pH to protect household plumbing
- •South Tacoma groundwater sits near legacy industrial areas and is monitored closely, with wellhead protections in place
Water Quality Data
Key contaminants detected vs. regulatory limits. All values from the most recent published report — Source: Tacoma Water 2024 Water Quality Report.
| Contaminant | Detected | Limit | Status |
|---|---|---|---|
| Chlorine (total) | 0.8 mg/L | 4.0 mg/L | ✓ |
| Fluoride | 0.72 mg/L | 4.0 mg/L | ✓ |
| Lead (90th percentile) | 1.5 µg/L | 15.0 µg/L | ✓ |
| Nitrate (as N) | 0.19 mg/L | 10.0 mg/L | ✓ |
| TTHM (Total Trihalomethanes) | 14.8 µg/L | 80.0 µg/L | ✓ |
| HAA5 (Haloacetic Acids) | 9.7 µg/L | 60.0 µg/L | ✓ |
✓ = below limit ⚠ = above health goal ✗ = exceeds guideline
How It Compares
With its closed watershed and mountain snowmelt source, Tacoma's water resembles Seattle's famously clean Cedar River supply — soft, low-mineral, and needing modest treatment.
Tips
- •No softener or filter is needed; the water is naturally soft and clean
- •Older homes benefit from the standard flush-the-tap habit after long stagnation, as with any soft-water city
- •Tacoma Water publishes annual quality reports and watershed updates
Frequently Asked Questions
Sources & References
The safety rating and guidance on this page draw on the following sources. See our full methodology.
- •US EPA Safe Drinking Water Act regulations
- •EWG Tap Water Database
- •The utility's most recent Consumer Confidence Report (CCR)
- •WHO Guidelines for Drinking-water Quality