Nitrate in Hemet, CA Drinking Water
Nitrate data for Hemet, California · 137,343 residents · 4 ZIP codes
ZipCheckup's reading of Nitrate in Hemet, California: the highest detected level is 25 ppb; the EPA limit is 10 mg/L (as nitrogen). Nitrate carries a high health-risk designation.
EPA records show Nitrate detections in Hemet, California water samples.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13
Nitrate in Hemet Tap Water
Nitrate has been detected in Hemet, California drinking water at a maximum level of 25 ppm — 2.5x the EPA MCL.
This analysis covers 137,343 residents across 4 ZIP codes in Hemet.
Hemet's overall water quality grade is B (81/100).
Is Nitrate in Hemet Water Safe?
Nitrate was detected in Hemet 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 |
|---|---|---|---|
| 92545 | 25 ppm | 10 mg/L (as nitrogen) | Exceeds limit |
Average nitrate level across Hemet: 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 Hemet 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.