Radium in Petaluma, CA Drinking Water
Radium data for Petaluma, California · 71,339 residents · 6 ZIP codes
Over the past reporting period, water systems in Petaluma, California have recorded Radium at detectable concentrations in EPA compliance samples.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-04-05
Radium in Petaluma Tap Water
Radium has been detected in Petaluma, California drinking water at a maximum level of 15 pCi/L — 3x the EPA MCL.
This analysis covers 71,339 residents across 6 ZIP codes in Petaluma.
Petaluma's overall water quality grade is A (89/100).
Is Radium in Petaluma Water Safe?
Radium was detected in Petaluma water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.
If you are concerned, a reverse osmosis or ion exchange filter can reduce radium levels further.
Radium Levels by ZIP Code
| ZIP Code | Radium Level | EPA Limit | Status |
|---|---|---|---|
| 94952 | 15 pCi/L | 5 pCi/L (combined Ra-226 + Ra-228) | Exceeds limit |
| 94953 | 15 pCi/L | 5 pCi/L (combined Ra-226 + Ra-228) | Exceeds limit |
| 94954 | 15 pCi/L | 5 pCi/L (combined Ra-226 + Ra-228) | Exceeds limit |
| 94955 | 15 pCi/L | 5 pCi/L (combined Ra-226 + Ra-228) | Exceeds limit |
| 94975 | 15 pCi/L | 5 pCi/L (combined Ra-226 + Ra-228) | Exceeds limit |
| 94999 | 15 pCi/L | 5 pCi/L (combined Ra-226 + Ra-228) | Exceeds limit |
Average radium level across Petaluma: 15 pCi/L
Health Effects of Radium
- Increased risk of bone cancer (radium accumulates in bones)
- The body treats radium like calcium, storing it in bones
- Lifetime cancer risk of ~1 in 10,000 at 5 pCi/L
- No safe threshold for radioactive contamination
Health risk severity: High. Governed by the Radionuclides Rule.
How Radium Gets Into Drinking Water
- Natural radioactive decay in underground rock formations
- Groundwater sources (especially deep wells)
- Mining and industrial waste
- Higher in regions with specific geology (Midwest, parts of South)
What to Do About Radium in Petaluma Water
- Reverse osmosis (NSF 58 certified) removes 90%+ of radium
- Ion exchange (water softeners) can reduce radium
- Point-of-use RO at kitchen tap is most cost-effective
- GAC filters alone are NOT effective for radium
Look for filters certified under NSF 58 for radium removal.