What was found in ZIP 98370
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the 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
Highest in the ZIP: 2750 µg/L — NORTH PERRY AVE WATER DISTRICT · 24,402 people · 2018 | 5/5 | 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 ZIP: 2750 µg/L — NORTH PERRY AVE WATER DISTRICT · 24,402 people · 2018 | 5/5 | SYR4 |
| Fluoride | 716 µg/L 18% of the EPA limit 4000 µg/L Highest in the ZIP: POULSBO CITY OF · 18,400 people · 2019 | 1/5 | 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 ZIP: 35.008 µg/L — VINLAND · 4,801 people · 2019 | 5/5 | SYR4 |
| Chloroform | 7.06 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the ZIP: 30.76 µg/L — VINLAND · 4,801 people · 2019 | 5/5 | 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 ZIP: 15.53 µg/L — VINLAND · 4,801 people · 2019 | 5/5 | SYR4 |
| Trichloroacetic Acid | 3.3 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the ZIP: 11.4 µg/L — VINLAND · 4,801 people · 2019 | 5/5 | SYR4 |
| Barium | 10 µg/L 0.5% of the EPA limit 2000 µg/L Highest in the ZIP: NORTH PERRY AVE WATER DISTRICT · 24,402 people · 2018 | 1/5 | 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 | 1/5 | SYR4 |
| Arsenic | 7.34 µg/L 73% of the EPA limit 10 µg/L Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019 | 5/5 | SYR4 |
| Dichloroacetic Acid | 2.6 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the ZIP: 6.36 µg/L — VINLAND · 4,801 people · 2019 | 5/5 | SYR4 |
| Bromodichloromethane | 3.33 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the ZIP: 4.5 µg/L — NORTH PERRY AVE WATER DISTRICT · 24,402 people · 2019 | 5/5 | SYR4 |
| Dibromochloromethane | 2 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the ZIP: 2.6 µg/L — NORTH PENINSULA · 16,449 people · 2019 | 5/5 | SYR4 |
| Dibromoacetic Acid | 1 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019
Highest in the ZIP: 1.1 µg/L — NORTH PENINSULA · 16,449 people · 2019 | 2/5 | SYR4 |
| Lead | 1 µg/L 6.7% of the EPA limit 15 µg/L Highest in the ZIP: VINLAND · 4,801 people · 2019 | 1/5 | SYR4 |
| Bromoform | 0.9000 µg/L No EPA limit set Main supplier: SILVERDALE WATER DIST 16 · 35,163 people · 2019 | 3/5 | SYR4 |
| Combined Radium (-226 And -228) | 0.9000 pCi/L 18% of the EPA limit 5 pCi/L Highest in the ZIP: NORTH PENINSULA · 16,449 people · 2012 | 1/5 | 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 ZIP: 0.0040 mg/L — VINLAND · 4,801 people · 2025 | 5/5 | 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.
Water suppliers serving ZIP 98370
| Supplier | State | Population served |
|---|---|---|
| SILVERDALE WATER DIST 16 | WA | 35,163 |
| NORTH PERRY AVE WATER DISTRICT | WA | 24,402 |
| POULSBO CITY OF | WA | 18,400 |
| NORTH PENINSULA | WA | 16,449 |
| VINLAND | WA | 4,801 |
Frequently asked questions about ZIP 98370 tap water
Is the tap water in ZIP 98370 safe to drink?
EPA testing detected 18 contaminants across the water suppliers serving ZIP 98370. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 98370?
5 public water suppliers report EPA drinking-water monitoring for ZIP 98370. Each is listed above with its population served.
What contaminants are in ZIP 98370's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, TTHM, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.