Nitrate in Hannibal, MO Drinking Water
Nitrate data for Hannibal, Missouri · 24,770 residents · 1 ZIP code
For residents of Hannibal, Missouri, Nitrate has appeared in public water supply sampling data.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Nitrate in Hannibal Tap Water
Nitrate has been detected in Hannibal, Missouri drinking water at a maximum level of 6.972 ppb — below the EPA MCL of 10 mg/L (as nitrogen).
This analysis covers 24,770 residents across 1 ZIP code in Hannibal.
Hannibal's overall water quality grade is C (59/100).
Is Nitrate in Hannibal Water Safe?
Nitrate was detected in Hannibal 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 |
|---|---|---|---|
| 63401 | 6.972 ppm | 10 mg/L (as nitrogen) | OK |
Average nitrate level across Hannibal: 6.97 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 Hannibal 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.