Hard water in St. Marys, GA

Tap water hardness
144mg/L
8.4gpg
Hard

Reported by ST. Marys · April 2025

GA typical
28 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

St. Marys water measures 144 mg/L (8.4 gpg) of hardness, hard by USGS standards. The number comes from ST. Marys, dated April 2025.

St. Marys on the hardness scale, with nearby cities
060120180240300360+GA typical 28Statesboro: 26 mg/LStatesboro 26Valdosta: 32 mg/LValdosta 32Pooler: 69 mg/LPooler 69Savannah: 84 mg/LSavannah 84Georgetown: 87 mg/LGeorgetown 87Garden City: 87 mg/LGarden City 87Vidalia: 102 mg/LVidalia 102Jesup: 150 mg/LJesup 150Adel: 203 mg/LAdel 203Kingsland: 272 mg/LKingsland 272St. Marys 144mg/L as calcium carbonate060120180240300360+GA 28Pooler: 69 mg/LPooler 69Savannah: 84 mg/LSavannah 84Georgetown: 87 mg/LGeorgetown 87Garden City: 87 mg/LGarden City 87Jesup: 150 mg/LJesup 150Kingsland: 272 mg/LKingsland 272144 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

St. Marys sits 116 mg/L above the typical Georgia figure of 28. Of the 10 nearest cities we track, 7 have softer water and 3 have harder. The range nearby runs from 26 mg/L in Statesboro to 272 in Kingsland.

What 144 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 144 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.

Softener size for St. Marys

3 people × 75 gallons a day × 8.4 gpg = 1,894 grains a day. A 24,000-grain unit regenerates about every 12 days.

Size it for your household

EPA record for St. Marys's water system

ST. Marys · PWSID GA0390001

No health-based violations since 2016

Serves about 19,994 people from groundwater.

Health-based
0
Monitoring or reporting
10
Open now
5

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 St. Marys water hard?

Yes. It measures about 144 mg/L (8.4 grains per gallon), which the USGS classes as hard.

What is the water hardness in St. Marys in grains per gallon?

About 8.4 gpg. One grain per gallon equals 17.1 mg/L, so 144 mg/L divided by 17.1 gives 8.4.

What size water softener do I need in St. Marys?

For 3 people using 75 gallons each per day, 8.4 gpg works out to about 1,894 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.

Has the St. Marys water system had EPA violations?

EPA records show no health-based violations for ST. Marys since 2016. There were also 10 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 85 cities in Georgia

Hardness data: TapWaterData US Water Hardness (utility report, April 8, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.