Piedmont, CA Water Safety: 53/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Water compliance in Piedmont, CA ranks below average — documented gaps in multiple service areas.
How Piedmont Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Piedmont Water
- Estimated remediation: $400 per household.
- CDC health risk index: 9.67.
Who Supplies Your Water in Piedmont
Across most of Piedmont, CA, 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 Piedmont, California, covering 1 community water system serving approximately 1,442,800 people.
No EPA violations recorded across any ZIP codes in Piedmont — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Piedmont: D (53/100)
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
Piedmont water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Piedmont
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 94620 | D | EAST BAY MUD | 1,442,800 |
All ZIP Codes in Piedmont
- 94620 [D]
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 Piedmont
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 Piedmont
- 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.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Piedmont, CA