Anderson Island, WA Water Safety: 99/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-04
In current WA EPA data, Anderson Island's tap water sits in the high-safety tier.
How Anderson Island Compares
Data: EPA SDWIS Last verified: 2026-06-04
Anderson Island Water: The Quick Version
- Average lead level: 0.0026 mg/L.
- Homes built before 1986: 35% — older plumbing may contain lead solder.
- CDC health risk index: 11.95.
Water Systems Serving Anderson Island
2 independent water providers serve Anderson Island, WA — 2 systems appear in federal records.
Overview
We track water quality and home safety data for 1 ZIP code in Anderson Island, Washington (population ~1,341), covering 2 community water systems serving approximately 2,072 people region-wide.
No EPA violations recorded across any ZIP codes in Anderson Island — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Anderson Island: A (99/100)
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
Anderson Island water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0026 mg/L (EPA action level: 0.015 mg/L)
- 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 |
|---|---|---|---|
| 98303 | A | Lake Josephine Riviera | 1,380 |
All ZIP Codes in Anderson Island
- 98303 [A]
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.
CDC Health Data for Anderson Island
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
How Old Is Anderson Island's Housing Stock?
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
With a median build year of 1997, Anderson Island's housing stock reflects a city built across multiple eras. A substantial share of homes predate 1986 — the year lead solder in plumbing was federally banned — meaning the risk from plumbing materials is unevenly distributed across the city's neighborhoods and property types.
Most homes in Anderson Island 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.
Protecting Children from Lead in Anderson Island
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.
Routinely in Anderson Island, where 35% of housing predates the solder ban and aggregate utility readings hover near the federal threshold, a faucet-level draw functions as a standard household step for families with small kids.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Anderson Island, WA