South Colby, WA Water Safety: 66/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
South Colby, WA: mid-range safety grade, uneven compliance across service areas.
How South Colby Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Systems Serving South Colby
Across most of South Colby, WA, residential water comes from a single utility. That provider sets rates, manages infrastructure maintenance, and files compliance reports with the EPA on behalf of the households it serves. Federal tracking data shows 1 system on record, but one carries the bulk of the service load.
Overview
We track water quality and home safety data for 1 ZIP code in South Colby, Washington, covering 1 community water system serving approximately 28,928 people.
No EPA violations recorded across any ZIP codes in South Colby — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for South Colby: 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
South Colby water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for South Colby
- 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 |
|---|---|---|---|
| 98384 | C | West Sound Utility District #1 | 28,928 |
All ZIP Codes in South Colby
- 98384 [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.
CDC Health Data for South Colby
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
What You Can Do in South Colby
- 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. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for South Colby, WA