Nitrate · Ohio

Nitrate in Ohio Drinking Water — 61 ZIPs Tested

EPA data analysis for nitrate in Ohio drinking water systems

ZipCheckup tracks Nitrate in Ohio drinking water: 61 ZIP codes with detected levels on record. No ZIP codes exceed the EPA limit on record. Nitrate carries a high health-risk designation.

61
ZIPs with Detections
0
ZIPs with Violations
10 mg/L (as nitrogen)
EPA Limit
High
Health Risk
Reverse Osmosis or Ion Exchange
Best Filter Method

Nitrate Contamination in Ohio

ZipCheckup analyzed drinking water data across 1,435 ZIP codes in Ohio for nitrate contamination. 61 ZIP codes have reported nitrate detections, and 0 have EPA violations on record.

EPA Standard for Nitrate

The EPA maximum contaminant level (MCL) for nitrate is 10 mg/L (as nitrogen), governed by the National Primary Drinking Water Regulations. Water systems that exceed this limit must take corrective action and notify consumers.

Worst ZIP Codes for Nitrate in Ohio

These ZIP codes reported the highest nitrate levels in Ohio based on CCR reports and EPA data:

Lowest Nitrate Levels in Ohio

These ZIP codes had the lowest reported nitrate detections in Ohio:

Health Effects of Nitrate

How to Remove Nitrate From Drinking Water

The most effective treatment for nitrate removal is Reverse Osmosis or Ion Exchange. Look for filters certified under NSF 53 / NSF 58 standards.

Check Your ZIP Code

Use the ZipCheckup water quality search to see nitrate data for your specific water system in Ohio.

Worst ZIP Codes for Nitrate in Ohio

Ranked by highest nitrate detection level.

Rank ZIP Code City Level Detected EPA Limit Status
1 45356 Piqua 6610 ppb 10000 ppb Within Limit
2 43002 Amlin 6300 ppb 10000 ppb Within Limit
3 43017 Dublin 6300 ppb 10000 ppb Within Limit
4 43026 Hilliard 6300 ppb 10000 ppb Within Limit
5 43035 Lewis Center 6300 ppb 10000 ppb Within Limit
6 43054 New Albany 6300 ppb 10000 ppb Within Limit
7 43064 Plain City 6300 ppb 10000 ppb Within Limit
8 43065 Powell 6300 ppb 10000 ppb Within Limit
9 43082 Westerville 6300 ppb 10000 ppb Within Limit
10 43085 Columbus 6300 ppb 10000 ppb Within Limit
11 43109 Brice 6300 ppb 10000 ppb Within Limit
12 43119 Galloway 6300 ppb 10000 ppb Within Limit
13 43123 Grove City 6300 ppb 10000 ppb Within Limit
14 43137 Lockbourne 6300 ppb 10000 ppb Within Limit
15 43201 Columbus 6300 ppb 10000 ppb Within Limit
16 43202 Columbus 6300 ppb 10000 ppb Within Limit
17 43203 Columbus 6300 ppb 10000 ppb Within Limit
18 43204 Columbus 6300 ppb 10000 ppb Within Limit
19 43205 Columbus 6300 ppb 10000 ppb Within Limit
20 43206 Columbus 6300 ppb 10000 ppb Within Limit

Lowest Nitrate Levels in Ohio

ZIP Code City Level Detected
43618 Oregon 5610 ppb
43616 Oregon 5610 ppb
43299 Columbus 6300 ppb
43291 Columbus 6300 ppb
43287 Columbus 6300 ppb
43279 Columbus 6300 ppb
43272 Columbus 6300 ppb
43271 Columbus 6300 ppb
43270 Columbus 6300 ppb
43268 Columbus 6300 ppb

Cities with Nitrate Data in Ohio

14 cities in Ohio have nitrate testing data available.

Ohio Water Quality Overview: See statewide water quality rankings on the Ohio water quality page.
Learn more about Nitrate: Read the full guide on Nitrate in drinking water.
Home → Contaminants → Nitrate → Ohio

How to cite this page

APA ZipCheckup. (2026). Nitrate in Ohio Drinking Water — 61 ZIPs Tested. https://zipcheckup.com/contaminants/nitrates/ohio/
BibTeX 
@misc{zipcheckup-contaminants-nitrates-ohio,
  author = {{ZipCheckup}},
  title  = {{Nitrate in Ohio Drinking Water — 61 ZIPs Tested}},
  year   = {2026},
  url    = {https://zipcheckup.com/contaminants/nitrates/ohio/}
}

Data as of July 2026.

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