What was found in Silverdale's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 2640 µg/L 26% of the EPA limit 10000 µg/L Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019 | 4/8 | SYR4 |
| Nitrate-Nitrite | 1734 µg/L 17% of the EPA limit 10000 µg/L Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the city: 2010 µg/L — CRYSTAL CREEK · 123 people · 2018 | 4/8 | SYR4 |
| TTHM | 11.475 µg/L 14% of the EPA limit 80 µg/L Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the city: 75.875 µg/L — JACKSON PARK NAVAL HOSPITAL · 2,277 people · 2019 | 5/8 | SYR4 |
| Chloroform | 7.06 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the city: 68.065 µg/L — JACKSON PARK NAVAL HOSPITAL · 2,277 people · 2019 | 5/8 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5.7 µg/L 9.5% of the EPA limit 60 µg/L Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2018
Highest in the city: 50.68 µg/L — NAVAL BASE KITSAP AT BREMERTON · 11,792 people · 2019 | 5/8 | SYR4 |
| Trichloroacetic Acid | 3.3 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the city: 34.835 µg/L — NAVAL BASE KITSAP AT BREMERTON · 11,792 people · 2019 | 5/8 | SYR4 |
| Copper | 29 µg/L 2.2% of the EPA limit 1300 µg/L Highest in the city: NAVAL BASE KITSAP AT BANGOR · 16,828 people · 2013 | 2/8 | SYR4 |
| Dichloroacetic Acid | 2.6 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the city: 19.95 µg/L — NAVAL BASE KITSAP AT BREMERTON · 11,792 people · 2019 | 5/8 | SYR4 |
| Lead | 11.8 µg/L 79% of the EPA limit 15 µg/L Highest in the city: NAVAL BASE KITSAP AT BANGOR · 16,828 people · 2013 | 2/8 | SYR4 |
| Bromodichloromethane | 3.33 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the city: 11.3 µg/L — JACKSON PARK NAVAL HOSPITAL · 2,277 people · 2019 | 5/8 | SYR4 |
| Dibromochloromethane | 2 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the city: 11.14 µg/L — JACKSON PARK NAVAL HOSPITAL · 2,277 people · 2019 | 5/8 | SYR4 |
| Chromium | 9.85 µg/L 9.9% of the EPA limit 100 µg/L Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019 | 1/8 | SYR4 |
| Arsenic | 7.34 µg/L 73% of the EPA limit 10 µg/L Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019 | 2/8 | SYR4 |
| Bromoform | 0.9000 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the city: 7.1 µg/L — JACKSON PARK NAVAL HOSPITAL · 2,277 people · 2019 | 4/8 | SYR4 |
| Monochloroacetic Acid | 3.4 µg/L No EPA limit set Highest in the city: NAVAL BASE KITSAP AT BREMERTON · 11,792 people · 2019 | 1/8 | SYR4 |
| Dibromoacetic Acid | 1 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the city: 2.54 µg/L — JACKSON PARK NAVAL HOSPITAL · 2,277 people · 2019 | 3/8 | SYR4 |
| Combined Radium (-226 And -228) | 0.4000 pCi/L 8% of the EPA limit 5 pCi/L Highest in the city: ERLAND POINT WATER CO · 2,909 people · 2012 | 1/8 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2025
Highest in the city: 0.0060 mg/L — ERLAND POINT WATER CO · 2,909 people · 2023 | 8/8 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Silverdale
| Supplier | Population served |
|---|---|
| SILVERDALE WATER DIST 16 | 35,163 |
| NAVAL BASE KITSAP AT BANGOR | 16,828 |
| NAVAL BASE KITSAP AT BREMERTON | 11,792 |
| ERLAND POINT WATER CO | 2,909 |
| JACKSON PARK NAVAL HOSPITAL | 2,277 |
| NAVAL BASE KITSAP AT KEYPORT | 1,540 |
| CRYSTAL CREEK | 123 |
| OLYMPIC VIEW WATER ASSOC | 41 |
Frequently asked questions about Silverdale tap water
Is Silverdale tap water safe to drink?
EPA testing detected 18 contaminants in the water serving Silverdale. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Silverdale?
8 public water suppliers report drinking-water monitoring for Silverdale, Washington to the EPA. Each is listed above with its population served.
What contaminants are in Silverdale's water?
The contaminants EPA monitoring detected in Silverdale include Nitrate, Nitrate-Nitrite, TTHM, Chloroform, Total Haloacetic Acids (HAA5). The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.