Groundwater in Waseca County contains iron, arsenic, nitrate, nitrite, lead, and chloride--contaminants that well owners need to monitor. Several of these contaminants exceed EPA health standards, making testing and treatment important for this area.
These contaminants come from both natural sources and human activities. The limestone bedrock naturally contains iron and arsenic that dissolve into groundwater over time. Nitrate and nitrite seep down from fertilizers and manure used in the county's agricultural areas, while lead enters water from old pipes and fixtures in some homes. Chloride can come from road salt and septic systems.
Groundwater in Waseca County is very hard, driven by elevated calcium and magnesium leaching from the limestone bedrock below. The limestone dissolves slowly as water moves through it, releasing these minerals into wells throughout the county. This hardness is widespread across the area's wells.
Wells in Waseca County have been found with arsenic, chloride, iron, lead, nitrate, and nitrite above EPA health standards. Arsenic and lead are particularly concerning because they can damage your organs and nervous system even at low levels over time. Nitrate and nitrite harm infants and can interfere with how blood carries oxygen. Chloride at high levels is a concern for people who need to watch their sodium intake for heart or kidney health.
The very hard water in county wells leaves scale buildup on pipes, fixtures, and inside appliances like water heaters and dishwashers, shortening their lifespans. Iron stains laundry, sinks, and tubs orange or brown. You may notice a metallic taste or reddish discoloration in your water.
We recommend testing your well as soon as possible. Every well is different, and yours could have higher or lower levels than what we see across the county. A comprehensive panel testing for metals and bacteria costs between $200 and $400 and is the only way to know what treatment your water actually needs. Water softening can reduce hardness, and carbon filters or reverse osmosis systems can address multiple contaminants.
Not sure if your well is affected? Get certified results in 5–7 days.
Test Your Well Water with Tap Score →| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Iron | 19 | 89% | Moderate | High | |
| Manganese | 19 | 68% | Moderate | High | |
| Nitrate | 8 | 25% | Low | High ⓘ | |
| Arsenic | 14 | 21% | Low | High | |
| PFOA ⓘ municipal | 6 | 17% | Low | High ⓘ | |
| Chloride | 19 | 0% | Moderate | Low | |
| Fluoride | 19 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| Lead | 15 | 0% | Moderate | Low | |
| Nitrite | 2 | 0% | Low | Low ⓘ | |
| PFHxS ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| PFNA ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| PFOS ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| Sulfate | 19 | 0% | Moderate | Low | |
| pH | 10 | — | Low | Low | |
| Sodium | 19 | — | Moderate | Low | |
| Hardness | 10 | — | Low | Low | |
| PFBS ⓘ municipal | 5 | — | Low | Safe ⓘ |
MCL = Maximum Contaminant Level (EPA limit for public water; used as benchmark for private wells). Distribution shows % of sampled wells in each concentration band. Methodology.
* Microbial contaminants (E. coli, coliform) reflect only samples from the last 10 years.
Data shows potential risk — a certified test confirms whether your water is affected.
Order a Tap Score Test →Population-level CDC data. Not individual risk prediction.
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