Water Health Check Report
Seattle, WA
Seattle Public Utilities · Surface water source · Cedar River Watershed (primary, ~70%) and South Fork Tolt River (~30%) — both protected forest land with no agriculture or development upstream. Gravity-fed from the Cascades. Treated at Cedar Falls and Tolt treatment plants. Not fluoridated.
Good — with 3 concerns
Seattle Public Utilities meets all federal legal limits but 3 contaminants exceed EWG health guidelines. No PFAS detected in UCMR5 sampling
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Lead—source matters
Lead in tap water comes from household plumbing, not the source water or treatment plant. Seattle water leaves the treatment plant lead-free. Risk depends on your building's internal plumbing—highest in homes built before 1986, when lead solder was common. A NSF/ANSI 53 certified pitcher or under-sink filter removes lead at point of use.
Contaminants tested
10 total · 3 above EWG guideline| Contaminant | Level | Status |
|---|---|---|
Total trihalomethanes (TTHMs) CAS Various | 9.3 ppb | Above guideline |
Haloacetic acids (HAA5) CAS Various | 5.8 ppb | Above guideline |
Copper CAS 7440-50-8 | 0.31 ppm | Above guideline |
Nitrate CAS 14797-55-8 | 0.06 ppm | Within limits |
Fluoride CAS 16984-48-8 | 0.10 ppm | Within limits |
Lead CAS 7439-92-1 | 1.2 ppb | Within limits |
Chlorine (residual) CAS 7782-50-5 | 0.70 ppm | Within limits |
PFOS (perfluorooctane sulfonate) CAS 1763-23-1 | ND | Not detected |
PFOA (perfluorooctanoic acid) CAS 335-67-1 | ND | Not detected |
Arsenic CAS 7440-38-2 | ND | Not detected |
Filter recommendation
3 contaminants above guidelines. Here's what removes them.
A guided 4-question flow matches you to the right filter for your setup, budget, and household.
Want to go further than filtration?
Your report shows 3 contaminants above health guidelines. A specialist at Drawn can give you an expert read on your specific profile — what to prioritise, which filters actually address it, and what optimisation looks like for your household.
What a consultation covers
- Your contaminant profile explained in plain English
- Filter recommendations matched to what's actually in your water
- Optimisation options for households ready for that conversation
20 min · Free · No obligation
Data sources
Status flags compare detected levels against both EPA legal limits and EWG health-based guidelines—which are stricter and science-derived, independent of political feasibility.