Silverlake, WA Water Safety: 66/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Silverlake water quality is uneven — some service areas show clean compliance; others carry documented violations in WA EPA records.
How Silverlake Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Silverlake Water
- Homes built before 1986: 44% — older plumbing may contain lead solder.
- CDC health risk index: 13.81 — above typical levels.
Who Supplies Your Water in Silverlake
With one provider handling most of Silverlake's residential supply in WA, water service accountability is concentrated in a single utility among the 1 system on record.
Overview
We track water quality and home safety data for 1 ZIP code in Silverlake, Washington (population ~2,195), covering 1 community water system serving approximately 4,367 people region-wide.
No EPA violations recorded across any ZIP codes in Silverlake — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Silverlake: C (66/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Silverlake water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Silverlake
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 98645 | C | CASTLE ROCK MUNICIPAL WATER | 4,367 |
All ZIP Codes in Silverlake
- 98645 [C]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Health Outcomes in Silverlake
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Housing & Infrastructure in Silverlake
With 44% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Reading the housing data for Silverlake, with a median build year of 1997, reveals a community where neither old nor new construction dominates. That balanced profile means lead-solder-era plumbing is present throughout a meaningful portion of the residential inventory — with risk concentrated in properties built before 1986 and most acute in those that predate 1970.
Most homes in Silverlake were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Lead Exposure Risk for Children in Silverlake
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Although utility-side compliance with federal Lead and Copper requirements remains the system reference, that compliance does not extend down into interior plumbing. With 44% of Silverlake stock built before the solder ban and aggregate readings at or beyond the action mark, a household-level sample becomes the practical way to close that information gap.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Silverlake
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. With 44% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Silverlake, WA