Nitrate in Friendswood, TX Drinking Water
Nitrate data for Friendswood, Texas · 43,319 residents · 2 ZIP codes
Within Friendswood, Texas, Nitrate has been detected in water samples drawn from the public supply — the results are part of the official EPA compliance record for systems here.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Nitrate in Friendswood Tap Water
Nitrate has been detected in Friendswood, Texas drinking water at a maximum level of 150 ppb — below the EPA MCL of 10 mg/L (as nitrogen).
This analysis covers 43,319 residents across 2 ZIP codes in Friendswood.
Friendswood's overall water quality grade is B (71/100).
Is Nitrate in Friendswood Water Safe?
Nitrate was detected in Friendswood 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 |
|---|---|---|---|
| 77546 | 150 ppm | 10 mg/L (as nitrogen) | OK |
| 77549 | 150 ppm | 10 mg/L (as nitrogen) | OK |
Average nitrate level across Friendswood: 150 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 Friendswood 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.