Kitsap County Water Quality: 5 Cities Ranked by the Records

Name: Kitsap County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Kitsap County, Washington: 5 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Kitsap County

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Lead (90th percentile)Detected in 4 systems of 5 tested15 µg/L federal action level · US EPAHighest5 µg/L

BREMERTON CITY OF5 µg/LMonitoring period: 2021–2023
BAINBRIDGE ISLAND CITY OF3 µg/LMonitoring period: 2023–2025
SILVERDALE WATER DIST 162 µg/LMonitoring period: 2023–2025
POULSBO CITY OF1 µg/LMonitoring period: 2023–2025
PORT ORCHARD WATER DEPTNot detectedMonitoring period: 2022–2024

Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 5 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest4.9 ng/L

BREMERTON CITY OF4.9 ng/LSample date: 2024-07-08 to 2025-04-01
BAINBRIDGE ISLAND CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-06-07 to 2023-12-13
PORT ORCHARD WATER DEPTNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-07-21 to 2025-12-02
POULSBO CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-23 to 2025-04-14
SILVERDALE WATER DIST 16Not detected · below 3.0 ng/L lab reporting limitSample date: 2024-04-23 to 2025-07-16

29 substances tested, none detected in any systemShow

Tested in these 5 systems: BAINBRIDGE ISLAND CITY OF, BREMERTON CITY OF, PORT ORCHARD WATER DEPT, POULSBO CITY OF, SILVERDALE WATER DIST 16

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
Lithium
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanoic acid (PFBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorononanoic acid (PFNA)
Perfluorooctanesulfonic acid (PFOS)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

5 cities

Cities ranked by the records

1
Port OrchardPORT ORCHARD WATER DEPT
No PFAS detected
Open city report →
2
PoulsboPOULSBO CITY OF
No PFAS detectedLead below action level
Open city report →
3
SilverdaleSILVERDALE WATER DIST 16
No PFAS detectedLead below action level
Open city report →
4
Bainbridge IslandBAINBRIDGE ISLAND CITY OF
No PFAS detectedLead below action level
Open city report →
5
BremertonBREMERTON CITY OF
PFAS detected, within limitLead below action level
Open city report →

Showing 5 of 5 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Kitsap CountyPFAS detected in 1 of 5 cities; none had a sample above a 2024 EPA limit

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Washington

Lead

0of 5 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Washington

Who supplies the county

Largest water systems

BremertonBREMERTON CITY OF · WA5308200
72,951 served
SilverdaleSILVERDALE WATER DIST 16 · WA5379300
35,163 served
PoulsboPOULSBO CITY OF · WA5369150
18,400 served
Port OrchardPORT ORCHARD WATER DEPT · WA5368900
15,355 served
Bainbridge IslandBAINBRIDGE ISLAND CITY OF · WA5397650
13,491 served

Questions

Frequently asked

How does Kitsap County tap water compare across cities?

PurityMap ranks 5 cities in Kitsap County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Port Orchard's main water system: PORT ORCHARD WATER DEPT · PWSID WA5368900 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Kitsap County cities had a PFAS sample above a 2024 EPA limit?

None of the 5 Kitsap County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 1.

Is there lead in Kitsap County tap water?

Utilities report lead as a 90th-percentile result from home taps. 4 of 5 Kitsap County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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