Hard well water: when to soften, $1,495–$2,495 for a softener
Water above 120 mg/L of calcium carbonate is hard and above 180 is very hard, on the USGS scale. There is no federal health limit for hardness. A water softener costs $1,495–$2,495 before installation on supplier Mid Atlantic Water's 2026 prices, though its callers report $2,000–$6,750 installed.
1,Key figures
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How hard is hard
USGS defines hardness as the amount of dissolved calcium and magnesium in the water and classes it like this.
| Class | mg/L as calcium carbonate |
|---|---|
| Soft | 0–60 |
| Moderately hard | 61–120 |
| Hard | 121–180 |
| Very hard | over 180 |
Lab reports sometimes give hardness in grains per gallon. Ask the lab for mg/L to match this scale.
Sources1
Is it a health problem
No federal standard applies. EPA lists no primary or secondary limit for hardness itself; the nearest secondary standard is total dissolved solids at 500 mg/L. Hardness is a scale and soap problem, which makes softening a choice rather than a fix.
Sources3
What a softener costs
Mid Atlantic Water lists softeners at $1,495–$2,495 for the equipment and a plumber install at $500–$1,200. It says callers report quotes of $2,000–$6,750 installed; those are unverified. A softener also handles low iron. Virginia Cooperative Extension lists ion exchange for combined iron and manganese of 5 mg/L or less.
Common questions
Does a softener remove arsenic or nitrate?
No. Ohio's health department says softeners do not remove arsenic, and Nebraska Extension says standard softeners do not remove nitrate.
For the cost of a finished well in your state, see well drilling costs.
Sources
- Hardness of Water , USGS Water Science School. Accessed November 9, 2026. August 24, 2026
- Whole house water filter system cost: what you'll actually pay in 2026 , Mid Atlantic Water (online supplier). Accessed November 9, 2026. Prices dated October 2, 2026; updated November 5, 2026
- Secondary Drinking Water Standards: Guidance for Nuisance Chemicals , U.S. EPA. Accessed November 9, 2026. Last updated May 26, 2026
- Iron and Manganese in Household Water (Pub. 442-656) , Virginia Cooperative Extension, Virginia Tech. Accessed November 9, 2026. First published Feb 2020; last reviewed July 2025 (listed Aug 1, 2025)
- Arsenic Treatment and Removal for Private Water System Wells , Ohio Department of Health, Bureau of Environmental Health. Accessed November 9, 2026. June 2012 (cost estimates are 2012-era)
- Nitrate in Drinking Water , University of Nebraska-Lincoln (Nebraska Extension), Becky Schuerman. Accessed November 9, 2026. September 9, 2020
How these figures are built: methodology. Updated November 2026.