Is Silverdale, WA Tap Water Safe? Quality & Contaminants

What was found in Silverdale's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	2720 µg/L 27% of the EPA limit 10000 µg/L	4/8	SYR4
Nitrate-Nitrite	2010 µg/L 20% of the EPA limit 10000 µg/L	4/8	SYR4
TTHM	112.3 µg/L 140% of the EPA limit, in the worst sample — 80 µg/L	5/8	SYR4
Chloroform	109.6 µg/L No EPA limit set	5/8	SYR4
Total Haloacetic Acids (HAA5)	57.7 µg/L 96% of the EPA limit 60 µg/L	5/8	SYR4
Trichloroacetic Acid	37.6 µg/L No EPA limit set	5/8	SYR4
Copper	29 µg/L 2.2% of the EPA limit 1300 µg/L	2/8	SYR4
Dichloroacetic Acid	24 µg/L No EPA limit set	5/8	SYR4
Bromodichloromethane	14 µg/L No EPA limit set	5/8	SYR4
Dibromochloromethane	12 µg/L No EPA limit set	5/8	SYR4
Lead	12 µg/L 80% of the EPA limit 15 µg/L	2/8	SYR4
Bromoform	10.3 µg/L No EPA limit set	4/8	SYR4
Chromium	10 µg/L 10% of the EPA limit 100 µg/L	1/8	SYR4
Arsenic	8 µg/L 80% of the EPA limit 10 µg/L	2/8	SYR4
Monochloroacetic Acid	3.4 µg/L No EPA limit set	1/8	SYR4
Dibromoacetic Acid	2.6 µg/L No EPA limit set	3/8	SYR4
Combined Radium (-226 And -228)	0.4000 pCi/L 8% of the EPA limit 5 pCi/L	1/8	SYR4
Lead	0.0060 mg/L 40% of the EPA limit 0.0150 mg/L	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 single worst sample on record — 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 highest level found 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.