# Well Water Nerd

> Private well water quality, by town, from public data. Every page summarizes public groundwater sampling records (USGS Water Quality Portal and state agencies) for one place or one contaminant, names the source and date of every number, and states the key fact in one plain sentence at the top.

## States
- [Maine](https://wellwaternerd.com/well-water/maine): counties and towns with private well test results
  - [York County](https://wellwaternerd.com/well-water/maine/york)
  - [Washington County](https://wellwaternerd.com/well-water/maine/washington)
  - [Aroostook County](https://wellwaternerd.com/well-water/maine/aroostook)
  - [Lincoln County](https://wellwaternerd.com/well-water/maine/lincoln)
  - [Waldo County](https://wellwaternerd.com/well-water/maine/waldo)
  - [Oxford County](https://wellwaternerd.com/well-water/maine/oxford)
  - [Knox County](https://wellwaternerd.com/well-water/maine/knox)
  - [Sagadahoc County](https://wellwaternerd.com/well-water/maine/sagadahoc)
  - [Somerset County](https://wellwaternerd.com/well-water/maine/somerset)
  - [Franklin County](https://wellwaternerd.com/well-water/maine/franklin)
  - [Piscataquis County](https://wellwaternerd.com/well-water/maine/piscataquis)
  - [Androscoggin County](https://wellwaternerd.com/well-water/maine/androscoggin)
  - [Cumberland County](https://wellwaternerd.com/well-water/maine/cumberland)
  - [Kennebec County](https://wellwaternerd.com/well-water/maine/kennebec)
  - [Penobscot County](https://wellwaternerd.com/well-water/maine/penobscot)
  - [Hancock County](https://wellwaternerd.com/well-water/maine/hancock)
- [New Hampshire](https://wellwaternerd.com/well-water/new-hampshire): counties and towns with private well test results
  - [Sullivan County](https://wellwaternerd.com/well-water/new-hampshire/sullivan)
  - [Carroll County](https://wellwaternerd.com/well-water/new-hampshire/carroll)
  - [Rockingham County](https://wellwaternerd.com/well-water/new-hampshire/rockingham)
  - [Coos County](https://wellwaternerd.com/well-water/new-hampshire/coos)
  - [Cheshire County](https://wellwaternerd.com/well-water/new-hampshire/cheshire)
  - [Merrimack County](https://wellwaternerd.com/well-water/new-hampshire/merrimack)
  - [Belknap County](https://wellwaternerd.com/well-water/new-hampshire/belknap)
  - [Hillsborough County](https://wellwaternerd.com/well-water/new-hampshire/hillsborough)
  - [Strafford County](https://wellwaternerd.com/well-water/new-hampshire/strafford)
  - [Grafton County](https://wellwaternerd.com/well-water/new-hampshire/grafton)
- [Vermont](https://wellwaternerd.com/well-water/vermont): counties and towns with private well test results
  - [Windsor County](https://wellwaternerd.com/well-water/vermont/windsor)
  - [Essex County](https://wellwaternerd.com/well-water/vermont/essex)
  - [Lamoille County](https://wellwaternerd.com/well-water/vermont/lamoille)
  - [Caledonia County](https://wellwaternerd.com/well-water/vermont/caledonia)
  - [Addison County](https://wellwaternerd.com/well-water/vermont/addison)
  - [Orange County](https://wellwaternerd.com/well-water/vermont/orange)
  - [Chittenden County](https://wellwaternerd.com/well-water/vermont/chittenden)
  - [Rutland County](https://wellwaternerd.com/well-water/vermont/rutland)
  - [Orleans County](https://wellwaternerd.com/well-water/vermont/orleans)
  - [Grand Isle County](https://wellwaternerd.com/well-water/vermont/grand-isle)
  - [Franklin County](https://wellwaternerd.com/well-water/vermont/franklin)
  - [Washington County](https://wellwaternerd.com/well-water/vermont/washington)
  - [Windham County](https://wellwaternerd.com/well-water/vermont/windham)
  - [Bennington County](https://wellwaternerd.com/well-water/vermont/bennington)

## Contaminants
- [Arsenic](https://wellwaternerd.com/contaminants/arsenic): EPA limit 10 ug/L
- [Chloride](https://wellwaternerd.com/contaminants/chloride): no federal limit
- [Copper](https://wellwaternerd.com/contaminants/copper): EPA limit 1.3 mg/L
- [E. coli](https://wellwaternerd.com/contaminants/e-coli): EPA limit 0 MPN/100mL
- [Fluoride](https://wellwaternerd.com/contaminants/fluoride): EPA limit 4 mg/L
- [Gross alpha](https://wellwaternerd.com/contaminants/gross-alpha): EPA limit 15 pCi/L
- [Iron](https://wellwaternerd.com/contaminants/iron): no federal limit
- [Lead](https://wellwaternerd.com/contaminants/lead): EPA limit 15 ug/L
- [Manganese](https://wellwaternerd.com/contaminants/manganese): no federal limit
- [Nitrate](https://wellwaternerd.com/contaminants/nitrate): EPA limit 10 mg/L
- [Nitrite](https://wellwaternerd.com/contaminants/nitrite): EPA limit 1 mg/L
- [PFHxS](https://wellwaternerd.com/contaminants/pfhxs): EPA limit 10 ng/L
- [PFNA](https://wellwaternerd.com/contaminants/pfna): EPA limit 10 ng/L
- [PFOA](https://wellwaternerd.com/contaminants/pfoa): EPA limit 4 ng/L
- [PFOS](https://wellwaternerd.com/contaminants/pfos): EPA limit 4 ng/L
- [Radium (226 + 228)](https://wellwaternerd.com/contaminants/radium): EPA limit 5 pCi/L
- [Radon](https://wellwaternerd.com/contaminants/radon): no federal limit
- [Sodium](https://wellwaternerd.com/contaminants/sodium): no federal limit
- [Uranium](https://wellwaternerd.com/contaminants/uranium): EPA limit 30 ug/L

## Method
- Non-detects count as samples and are treated as zero for medians.
- A geo page is published only when at least one contaminant has the minimum sample count; thinner places roll up to their county.
- Exactly at the limit counts as not above it.