Nitrate in La Canada Flintridge, CA Drinking Water
Nitrate data for La Canada Flintridge, California · 10,070 residents · 2 ZIP codes
People in La Canada Flintridge, California who get water from the public supply are among residents whose systems have returned Nitrate detections in EPA compliance testing.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Nitrate in La Canada Flintridge Tap Water
Nitrate has been detected in La Canada Flintridge, California drinking water at a maximum level of 25 ppb — below the EPA MCL of 10 mg/L (as nitrogen).
This analysis covers 10,070 residents across 2 ZIP codes in La Canada Flintridge.
La Canada Flintridge's overall water quality grade is B (76/100).
Is Nitrate in La Canada Flintridge Water Safe?
Nitrate was detected in La Canada Flintridge 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 nitrate levels further.
Nitrate Levels by ZIP Code
| ZIP Code | Nitrate Level | EPA Limit | Status |
|---|---|---|---|
| 91011 | 25 ppm as NO3 | 10 mg/L (as nitrogen) | OK |
| 91012 | 25 ppm as NO3 | 10 mg/L (as nitrogen) | OK |
Average nitrate level across La Canada Flintridge: 25 ppb
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 La Canada Flintridge 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.