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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Real EPA measurements of nitrates for Indiana water systems — Six-Year Review compliance samples 2012–2019 (historical). Methodology
Every Indiana system with a nitrates result in EPA's data, sorted by level. Averages of 2012–2019 finished-water samples, non-detects counted as zero — historical, not today's tap.
| City | Level | Period | EPA Limit | % of Limit | Status |
|---|---|---|---|---|---|
| Terre HauteGrade B | 3.58 mg/LAverage of 8 samples | 2012–2019 | 10.00 mg/L | 35.8% | Safe |
| RichmondGrade A | 2.53 mg/LAverage of 24 samples | 2012–2019 | 10.00 mg/L | 25.3% | Safe |
| JeffersonvilleGrade A | 2.12 mg/LAverage of 8 samples | 2012–2019 | 10.00 mg/L | 21.2% | Safe |
| South BendGrade B | 2.11 mg/LAverage of 142 samples | 2012–2019 | 10.00 mg/L | 21.1% | Safe |
| MuncieGrade A | 1.92 mg/LAverage of 8 samples | 2012–2019 | 10.00 mg/L | 19.2% | Safe |
| ColumbusGrade A | 1.79 mg/LAverage of 16 samples | 2012–2019 | 10.00 mg/L | 17.9% | Safe |
| Fort WayneGrade B | 1.50 mg/LAverage of 99 samples | 2012–2019 | 10.00 mg/L | 15.0% | Safe |
| KokomoGrade A | 1.18 mg/LAverage of 16 samples | 2012–2019 | 10.00 mg/L | 11.8% | Safe |
| EvansvilleGrade A | 1.08 mg/LAverage of 8 samples | 2012–2019 | 10.00 mg/L | 10.9% | Safe |
| ElkhartGrade B | 1.09 mg/LAverage of 27 samples | 2012–2019 | 10.00 mg/L | 10.9% | Safe |
| LafayetteGrade A | 0.960 mg/LAverage of 20 samples | 2012–2019 | 10.00 mg/L | 9.6% | Safe |
| SeymourGrade A | 0.963 mg/LAverage of 8 samples | 2012–2019 | 10.00 mg/L | 9.6% | Safe |
| IndianapolisGrade A | 0.951 mg/LAverage of 144 samples | 2012–2019 | 10.00 mg/L | 9.5% | Safe |
| West LafayetteGrade A | 0.933 mg/LAverage of 16 samples | 2012–2019 | 10.00 mg/L | 9.3% | Safe |
| PlainfieldGrade A | 0.843 mg/LAverage of 16 samples | 2012–2019 | 10.00 mg/L | 8.4% | Safe |
| MishawakaGrade B | 0.824 mg/LAverage of 25 samples | 2012–2019 | 10.00 mg/L | 8.2% | Safe |
| AndersonGrade C | 0.482 mg/LAverage of 14 samples | 2012–2019 | 10.00 mg/L | 4.8% | Safe |
| GreenwoodGrade A | 0.366 mg/LAverage of 16 samples | 2012–2019 | 10.00 mg/L | 3.7% | Safe |
| HammondGrade A | 0.357 mg/LAverage of 4 samples | 2012–2019 | 10.00 mg/L | 3.6% | Safe |
| Michigan CityGrade A | 0.302 mg/LAverage of 4 samples | 2012–2019 | 10.00 mg/L | 3.0% | Safe |
| CarmelGrade C | 0.192 mg/LAverage of 41 samples | 2012–2019 | 10.00 mg/L | 1.9% | Safe |
| LawrenceGrade F | 0.104 mg/LAverage of 15 samples | 2012–2019 | 10.00 mg/L | 1.0% | Safe |
| WestfieldGrade A | 0.079 mg/LAverage of 44 samples | 2012–2019 | 10.00 mg/L | 0.8% | Safe |
| NoblesvilleGrade A | 0.082 mg/LAverage of 22 samples | 2012–2019 | 10.00 mg/L | 0.8% | Safe |
| BloomingtonGrade B | 0.037 mg/LAverage of 8 samples | 2012–2019 | 10.00 mg/L | 0.4% | Safe |
Showing 25 of 28 cities. View individual city pages for detailed reports.
Nitrates pose the greatest risk to infants under six months of age. High nitrate levels can cause methemoglobinemia, also known as "blue baby syndrome," which reduces the blood's oxygen-carrying capacity. Pregnant women are also at risk as nitrate exposure has been linked to neural tube defects, preterm birth, and low birth weight. IMPORTANT: Boiling water does NOT remove nitrates - it concentrates them.
Runoff from fertilizer use; leaching from septic tanks; erosion of natural deposits; agricultural runoff
Based on our analysis of EPA Safe Drinking Water Information System (SDWIS) data and local water utility reports,nitrates has been detected in 28 Indiana water systems. The average level across all tested cities is 9% of the EPA Maximum Contaminant Level (MCL), with the highest detection at 35.8% of the limit.
The EPA MCL for nitrate is 10 mg/L measured as nitrogen. The EPA MCL for nitrates is 10 mg/L. This limit is set to protect public health based on available scientific evidence about the contaminant's health effects.
28 Indiana cities have nitrates detected in their water supply. All tested cities are within EPA safety limits.
Blue baby syndrome in infants, pregnancy complications, potential cancer risk. The most vulnerable groups include infants under 6 months and pregnant women.
The most effective methods for removing nitrates include Reverse Osmosis, Ion Exchange, Distillation. Look for filters certified by NSF/ANSI for nitrates reduction.
The EPA Maximum Contaminant Level (MCL) for nitrates is 10 mg/L.The EPA MCL for nitrate is 10 mg/L measured as nitrogen.
This page shows what Indiana utilities reported for nitrates. It cannot tell you what is coming out of your own tap: utility samples are taken across a whole system and averaged, levels vary by address and season, and anything picked up after the water leaves the main never appears in their report.
Home water test kitscheck your own tap before buying any filterRecommended filtration methods for nitrates removal:
Removes 83-92% of nitrates
Specifically designed for nitrate removal
Effective but energy-intensive
Paid links. We earn a commission if you buy, at no extra cost to you. Filters are matched to the removal methods listed above for nitrates.