EPA system WA5340800 · Washington

Northshore Utility District: No PFAS or lithium found in EPA testing

System ID WA5340800; community water system; Washington; source: purchased surface water; serves 99,789 people via 32,644 connections; status: active

In focus99,789people served, EPA registry

Public records. Clearer context.

Northshore Utility District is a local-government-owned community water system in Washington serving about 99,789 people, matched to 5 ZIP codes.

PFAS treatment declared to EPA: None declared (1 of 1 sampling events) · PFAS found before UCMR 5: Yes, at 1 of 4 sampling events

PFAS and lithium: what EPA's national survey found

EPA tested this water for 30 substances and found none of them at levels its laboratories can measure.

Between March 2023 and December 2023, EPA's UCMR 5 program tested 120 samples from 1 sampling location for 30 contaminants (29 PFAS plus lithium). None were found above their minimum reporting levels.

Sampling-point average: mean of a location's two (ground water) or four (surface water) UCMR 5 results with non-detects counted as zero, EPA's method for comparing UCMR 5 data to the PFAS MCLs. EPA rounds to the reference value's significant digits before deciding whether an average is "greater than" an MCL (PFOA/PFOS averages count as above 4.0 ng/L only from 4.05 ng/L; lithium results count as above the 10 ppb reference only from 15 ppb). This site does not apply that rounding: "at or above" here means the measured value is numerically at or above the reference.

Utility-reported context (UCMR 5 questionnaire, aggregated across sampling events): PFAS previously found at this system: no at 3 of 4 sampling events, yes at 1 of 4 sampling events; potential PFAS sources nearby: no at 4 of 4 sampling events; PFAS treatment in place: no PFAS treatment at 1 of 1 sampling event.

Lead at customer taps

In the latest completed monitoring period, ending Dec 31, 1992, 9 in 10 sampled homes had lead at or below 36 ppb, at or above the 15 ppb action level that triggers utility action. The action level has been reached in 2 of the 2 periods on record.

In the most recent completed lead monitoring period, ending Dec 31, 1992, the 90th-percentile lead result at customer taps was 36 ppb, at or above the action level of 15 ppb; 2 of the 2 monitoring periods on record reached the action level. The 90th percentile is the value that 9 in 10 sampled homes were at or below. Values are in parts per billion (ppb).

Drinking water violations since Sep 3, 2016

EPA lists no drinking-water violations for this utility since Sep 3, 2016.

EPA's SDWIS database lists no drinking water violations for this utility since Sep 3, 2016.

None on file.

Sanitary surveys and site visits

Most recent state inspection: Mar 25, 2025 (sanitary survey); 1 visit since Sep 3, 2021.

What you can do about these results

ZIP codes served

Sources

Data vintage: EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.

• EPA ECHO detailed facility report
• EPA UCMR 5 Data Finder
• EPA service-area boundary: modeled, 16.9 sq mi