Groundwater in Pierce County contains chloride and fluoride along with moderate hardness from calcium and magnesium. The good news is that contaminant levels here remain low and do not exceed EPA health standards.
Chloride and fluoride come from natural sources in the shallow sandy layers where the water moves. The surficial aquifer sits close to the surface, so it picks up these minerals as rainfall filters down through the soil and sediment. The area's sandy composition keeps contamination from getting too concentrated, which is why levels stay within safe bounds.
Groundwater in this county is moderately hard, driven by calcium and magnesium that dissolve from the sandy sediments as water passes through. This moderate hardness is common across wells in Pierce County and throughout the surrounding region, where the shallow aquifer naturally concentrates these minerals from the rock and soil above.
Good news--wells in Pierce County do not show contamination at levels that exceed EPA health standards. Your groundwater appears free from dangerous bacteria, nitrates, arsenic, and other regulated contaminants that pose serious health risks.
Wells in this county do have moderately hard water, which affects everyday life. Hard water leaves white crusty scale on faucets and fixtures, stains on dishes and laundry, and reduces how well soap works. Over time, this hardness can shorten the lifespan of water heaters and dishwashers. You may notice a slightly unpleasant taste or feel in your water as well.
We recommend testing your well to see exactly what minerals are in your water right now. Every well is different, and yours may have higher or lower hardness than what is common in the county. Testing is the only way to know for sure so you can choose the right treatment if needed. A basic test for hardness and minerals costs around $50 to $100. Water softeners or filtration systems can help if the hardness bothers you.
| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Fluoride | 5 | 0% | Low | Low ⓘ | |
| HFPO-DA (GenX) ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| PFOS ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| Sulfate | 5 | 0% | Low | Low ⓘ | |
| PFNA ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| PFHxS ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| PFOA ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| Chloride | 5 | 0% | Low | Low ⓘ | |
| Fluoride | 5 | 0% | Low | Low ⓘ | |
| HFPO-DA (GenX) ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| Hardness | 5 | — | Low | Low ⓘ | |
| PFBS ⓘ municipal | 5 | — | Low | Safe ⓘ | |
| pH | 4 | — | Low | Low ⓘ | |
| Sodium | 4 | — | Low | Low ⓘ |
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.
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