Well water in Nemaha County, Nebraska
In Nemaha County, 33% of 138 tested well samples exceeded the EPA limit for nitrate (10 mg/L), based on public data from Nebraska Groundwater Quality Clearinghouse and USGS Water Quality Portal.
138 individual samples from 83 wells, 1978 to 2024. Data refreshed September 9, 2026.
What individual samples found
Each row summarizes every public sample for that contaminant inside Nemaha County. Above limit means above the EPA maximum contaminant level; where EPA has no enforceable limit, the row shows a health guideline or nuisance level instead.
| Contaminant | Samples | Detected | Above limit | Median | Highest | Limit | |
|---|---|---|---|---|---|---|---|
| Nitrate 1978 to 2024 | 138 | 95% | 33% | 6.34 | 96 | 10 mg/L EPA limit |
Sampled fewer than 10 times, too few to summarize: Uranium (3), Arsenic (1).
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What this means
The contaminants most often above their limit here are nitrate (33% of 138 samples). A well next door can differ sharply from yours because bedrock fractures, well depth and plumbing all matter, so these rates describe the area, not your tap.
What to test for in Nemaha County
- Nitrate33% of 138 local samples were above the limit.
- Coliform bacteriaRecommended for every private well, every year.
Treatment that fits the local profile
- Nitrate
- Point-of-use reverse osmosis; Anion exchange; Distillation
Get your Nemaha County water tested at home
A licensed local water treatment company tests your tap water in your home, walks you through the numbers, and quotes treatment only if something needs fixing. Free, about 30 minutes, no obligation. Tell us what you need and we match you with a company that serves Nemaha County.
Common questions
Is there arsenic in well water in Nemaha County?
Arsenic was detected in 100% of 1 public well samples in Nemaha County, and 0% were above the EPA limit of 10 ug/L. Arsenic has no taste or smell; a lab test is the only way to know your level.
How often should I test a private well in Nemaha County?
Test for bacteria and nitrate every year. Test once for arsenic, uranium, radon, fluoride, manganese and PFAS, then again every three to five years or after any change in taste, color, or plumbing.
Sources
- Nebraska Groundwater Quality Clearinghouse: 138 samples in Nemaha County. Groundwater quality results compiled by the Nebraska Department of Environment and Energy, University of Nebraska and Nebraska Department of Agriculture in the Groundwater Quality Clearinghouse, contributed by Natural Resources Districts and state agencies. Retrieved September 9, 2026.
- USGS Water Quality Portal: 4 samples in Nemaha County. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
Non-detects count as samples and are treated as zero when computing medians. Exactly at the limit counts as not above it. A sample belongs to the town containing the well's reported coordinates.