Nitrate in Chino Hills, CA Drinking Water
Nitrate data for Chino Hills, California · 78,200 residents · 1 ZIP code
ZipCheckup's reading of Nitrate in Chino Hills, California: the highest detected level is 5.8 ppb; the EPA limit is 10 mg/L (as nitrogen). Nitrate carries a high health-risk designation.
Because Nitrate is associated with health effects at sustained elevated exposures, residents in Chino Hills, California may find it useful that local water systems have returned detectable concentrations - facts that bear on long-term household water decisions.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13
Nitrate in Chino Hills Tap Water
Nitrate has been detected in Chino Hills, California drinking water at a maximum level of 5.8 ppm — below the EPA MCL of 10 mg/L (as nitrogen).
This analysis covers 78,200 residents across 1 ZIP code in Chino Hills.
Chino Hills's overall water quality grade is B (83/100).
Is Nitrate in Chino Hills Water Safe?
Nitrate was detected in Chino Hills 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 |
|---|---|---|---|
| 91709 | 5.8 ppm | 10 mg/L (as nitrogen) | OK |
Average nitrate level across Chino Hills: 5.8 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 Chino Hills 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.