Pierce County groundwater contains chloride and fluoride as the main contaminants detected in wells. Contaminant levels here are low and do not exceed EPA health standards.
The surficial aquifer system in this area sits close to the land surface, where it picks up chloride and fluoride from natural sources and human activities like road salt and fertilizer use. The sandy and loose soil layers that make up this shallow aquifer allow rainwater to move through quickly, which helps prevent heavy contamination from building up over time.
Groundwater in Pierce County is moderately hard, driven by calcium and magnesium dissolved from the rock layers below. This moderate hardness is common across most wells in the county because the surficial aquifer naturally contains these minerals as water moves through the sandy and gravelly soil.
Wells in Pierce County show no contaminants exceeding EPA health standards, which is good news for your family's health. However, the county does have elevated levels of chloride and fluoride in the groundwater that warrant your attention. While these are below emergency thresholds, testing your specific well is the best way to understand your exposure.
Wells in this county tend to have moderate hardness, which means you may notice scale buildup on faucets and shower heads, films on dishes after washing, and reduced lather from soap and shampoo. Hard water can shorten the lifespan of water heaters and dishwashers over time. The mineral content can also affect how your water feels and tastes.
We recommend testing your well to find out exactly what is in your water, since every well is different and yours may have higher or lower levels than what is common in the county. A basic screening for bacteria and nitrate runs around fifty to one hundred dollars, while a comprehensive metals and minerals panel costs two hundred to four hundred dollars. Treatment options like water softeners or reverse osmosis systems can address hardness and mineral concerns once you know your results.
| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Fluoride | 5 | 0% | Low | Low ⓘ | |
| HFPO-DA (GenX) ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| PFOA ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| PFNA ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| Fluoride | 5 | 0% | Low | Low ⓘ | |
| HFPO-DA (GenX) ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| Chloride | 5 | 0% | Low | Low ⓘ | |
| Nitrate | 5 | 0% | Low | Low ⓘ | |
| PFHxS ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| PFOS ⓘ municipal | 5 | 0% | Low | Safe ⓘ | |
| Sulfate | 5 | 0% | Low | Low ⓘ | |
| Hardness | 5 | — | Low | Low ⓘ | |
| PFBS ⓘ municipal | 5 | — | Low | Safe ⓘ | |
| Sodium | 4 | — | Low | Low ⓘ | |
| pH | 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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