Hard water in Cave Spring, VA
Reported by Western Virginia Water Authority · April 2025
- VA typical
- 65 mg/L
- EPA health violations since 2016
- 3
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Cave Spring has about 145 mg/L of hardness, which is 8.5 grains per gallon. On the USGS scale that counts as hard. The number comes from Western Virginia Water Authority, dated April 2025. Reports for this system disagree, with values from 145 to 210 mg/L.
Cave Spring sits 80 mg/L above the typical Virginia figure of 65. Of the 10 nearest cities we track, 6 have softer water and 2 have harder. The range nearby runs from 20 mg/L in Martinsville to 213 in Christiansburg.
What 145 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.
What to do about it
At 145 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 8.5 gpg = 1,908 grains a day. A 24,000-grain unit regenerates about every 12 days.
EPA record for Cave Spring's water system
3 health-based violations since 2016
Serves about 182,700 people from surface water.
- Health-based
- 3
- Monitoring or reporting
- 0
- Open now
- 0
TapWaterData ties Cave Spring to this system. EPA's service-area records do not name Cave Spring, so check the utility printed on your water bill.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Total trihalomethanes (TTHM)a disinfection byproduct | 2 | 2019–2020 | Resolved |
| Haloacetic acids (HAA5)a disinfection byproduct | 1 | 2017 | Resolved |
Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.
Questions
Is Cave Spring water hard?
Yes. It measures about 145 mg/L (8.5 grains per gallon), which the USGS classes as hard.
What is the water hardness in Cave Spring in grains per gallon?
About 8.5 gpg. One grain per gallon equals 17.1 mg/L, so 145 mg/L divided by 17.1 gives 8.5.
What size water softener do I need in Cave Spring?
For 3 people using 75 gallons each per day, 8.5 gpg works out to about 1,908 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.
Has the Cave Spring water system had EPA violations?
EPA records show 3 health-based violations for Western Virginia Water Authority since 2016, involving Total trihalomethanes (TTHM), Haloacetic acids (HAA5).
Nearby cities
- Roanoke145 mg/LHard
- Salem166 mg/LHard
- Vinton145 mg/LHard
- Christiansburg213 mg/LVery hard
- Blacksburg41 mg/LSoft
- Bedford65 mg/LModerately hard
- Radford55 mg/LSoft
- Collinsville26 mg/LSoft
- Martinsville20 mg/LSoft
- Timberlake33 mg/LSoft
Hardness data: TapWaterData US Water Hardness (utility report, April 14, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.