Nitrate in Salisbury, MD Drinking Water
Nitrate data for Salisbury, Maryland · 31,218 residents · 4 ZIP codes
SDWIS federal records include Nitrate detections tied to water systems serving Salisbury, Maryland.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Nitrate in Salisbury Tap Water
Nitrate has been detected in Salisbury, Maryland drinking water at a maximum level of 6 ppb — below the EPA MCL of 10 mg/L (as nitrogen).
This analysis covers 31,218 residents across 4 ZIP codes in Salisbury.
Salisbury's overall water quality grade is C (63/100).
Is Nitrate in Salisbury Water Safe?
Nitrate was detected in Salisbury 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 |
|---|---|---|---|
| 21801 | 6 ppm | 10 mg/L (as nitrogen) | OK |
| 21802 | 6 ppm | 10 mg/L (as nitrogen) | OK |
| 21803 | 6 ppm | 10 mg/L (as nitrogen) | OK |
| 21804 | 6 ppm | 10 mg/L (as nitrogen) | OK |
Average nitrate level across Salisbury: 6 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 Salisbury 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.