Nitrate in Knightdale, NC Drinking Water
Nitrate data for Knightdale, North Carolina · 33,750 residents · 1 ZIP code
Within Knightdale, North Carolina, 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: 2026-04-05
Nitrate in Knightdale Tap Water
Knightdale, North Carolina has 4 EPA violations related to nitrate in drinking water.
This analysis covers 33,750 residents across 1 ZIP code in Knightdale.
Knightdale's overall water quality grade is B (78/100).
Is Nitrate in Knightdale Water Safe?
If you live in an affected ZIP code, consider installing a reverse osmosis or ion exchange filter certified under NSF 53 / NSF 58 and testing your water independently.
EPA Violations for Nitrate in Knightdale
| Date | Violation Type | Status | ZIP Code |
|---|---|---|---|
| 2023-07-01 | Nitrate-Nitrite (Resolved) | Resolved | 27545 |
| 2023-04-01 | Nitrate-Nitrite (Resolved) | Resolved | 27545 |
| 2023-01-01 | Nitrate-Nitrite (Resolved) | Resolved | 27545 |
| 2022-10-01 | Nitrate-Nitrite (Resolved) | Resolved | 27545 |
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 Knightdale 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.