Nitrate in San Ramon, CA Drinking Water
Nitrate data for San Ramon, California · 86,600 residents · 2 ZIP codes
Across the water systems that serve San Ramon, California, Nitrate has appeared in EPA compliance samples — standard municipal treatment targets this contaminant, though detections in the compliance record indicate it has reached household taps at measurable levels.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-04-05
Nitrate in San Ramon Tap Water
San Ramon, California has 18 EPA violations related to nitrate in drinking water.
This analysis covers 86,600 residents across 2 ZIP codes in San Ramon.
San Ramon's overall water quality grade is D (52/100).
Is Nitrate in San Ramon Water Safe?
If you live in an affected ZIP code, consider installing a reverse osmosis or ion exchange filter certified under NSF 53 / NSF 58 and testing your water independently.
EPA Violations for Nitrate in San Ramon
| Date | Violation Type | Status | ZIP Code |
|---|---|---|---|
| 2025-04-01 | Nitrate-Nitrite (Known) | Known | 94582 |
| 2025-04-01 | Nitrate-Nitrite (Known) | Known | 94583 |
| 2025-01-01 | Nitrate-Nitrite (Known) | Known | 94582 |
| 2025-01-01 | Nitrate-Nitrite (Known) | Known | 94583 |
| 2024-10-01 | Nitrate-Nitrite (Known) | Known | 94582 |
| 2024-10-01 | Nitrate-Nitrite (Known) | Known | 94583 |
| 2024-04-01 | Nitrate-Nitrite (Known) | Known | 94582 |
| 2024-04-01 | Nitrate-Nitrite (Known) | Known | 94583 |
| 2024-01-01 | Nitrate-Nitrite (Known) | Known | 94582 |
| 2024-01-01 | Nitrate-Nitrite (Known) | Known | 94583 |
| 2023-10-01 | Nitrate-Nitrite (Known) | Known | 94582 |
| 2023-10-01 | Nitrate-Nitrite (Known) | Known | 94583 |
| 2023-07-01 | Nitrate-Nitrite (Known) | Known | 94582 |
| 2023-07-01 | Nitrate-Nitrite (Known) | Known | 94583 |
| 2023-04-01 | Nitrate-Nitrite (Known) | Known | 94582 |
| 2023-04-01 | Nitrate-Nitrite (Known) | Known | 94583 |
| 2023-01-01 | Nitrate-Nitrite (Known) | Known | 94582 |
| 2023-01-01 | Nitrate-Nitrite (Known) | Known | 94583 |
Health Effects of Nitrate
- Methemoglobinemia ("blue baby syndrome") in infants under 6 months
- Increased risk of colorectal and bladder cancer (long-term)
- Thyroid disease from chronic exposure
- Possible reproductive effects
Health risk severity: High. Governed by the National Primary Drinking Water Regulations.
How Nitrate Gets Into Drinking Water
- Agricultural fertilizer runoff
- Animal feedlot operations and manure
- Septic system leachate
- Urban stormwater and wastewater discharge
What to Do About Nitrate in San Ramon Water
- Reverse osmosis is the most effective method for nitrate removal
- Ion exchange systems designed for nitrate can also work
- Standard carbon filters do NOT remove nitrate
- Boiling water increases nitrate concentration — never boil for nitrate
Look for filters certified under NSF 53 / NSF 58 for nitrate removal.