How hard is the water in Odenton, MD?

Tap water hardness
77mg/L
4.5gpg
Moderately hardCounty estimate

County estimate from 159 water samples in Anne Arundel County · July 2026

MD typical
105 mg/L
Softener for 3 people
24k grain
Data
County estimate

Water samples from around Odenton put hardness at about 77 mg/L (4.5 gpg), which would be moderately hard on the USGS scale. Treat this as a rough guide: it is the median of 159 samples taken across Anne Arundel County, mostly wells and streams, not a test of Odenton's treated tap water.

Odenton on the hardness scale, with nearby cities
060120180240300360+MD typical 105Fort Meade: 4 mg/LFort Meade 4Severna Park: 35 mg/LSeverna Park 35Columbia: 74 mg/LColumbia 74Crofton: 77 mg/LCrofton 77Bowie: 78 mg/LBowie 78Fairwood: 78 mg/LFairwood 78Ellicott City: 82 mg/LEllicott City 82Takoma Park: 110 mg/LTakoma Park 110Baltimore: 169 mg/LBaltimore 169Towson: 216 mg/LTowson 216Odenton 77mg/L as calcium carbonate060120180240300360+MD 105Fort Meade: 4 mg/LFort Meade 4Severna Park: 35 mg/LSeverna Pa. 35Columbia: 74 mg/LColumbia 74Crofton: 77 mg/LCrofton 77Bowie: 78 mg/LBowie 78Fairwood: 78 mg/LFairwood 7877 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 77 mg/L, Odenton is 28 mg/L below the typical Maryland figure of 105. Of the 10 nearest cities we track, 3 have softer water and 6 have harder. The range nearby runs from 4 mg/L in Fort Meade to 216 in Towson.

What 77 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Odenton

3 people × 75 gallons a day × 4.5 gpg = 1,015 grains a day. A 24,000-grain unit regenerates about every 23 days.

Size it for your household

EPA record for Odenton's water system

We could not match Odenton to a community water system in EPA's records. Your water bill or the yearly Consumer Confidence Report names the system and its ID.

Questions

Is Odenton water hard?

Somewhat. It measures about 77 mg/L (4.5 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Odenton in grains per gallon?

About 4.5 gpg. One grain per gallon equals 17.1 mg/L, so 77 mg/L divided by 17.1 gives 4.5.

What size water softener do I need in Odenton?

For 3 people using 75 gallons each per day, 4.5 gpg works out to about 1,015 grains a day. A 24,000-grain softener covers that with a regeneration about every 23 days.

Nearby cities

All 24 cities in Maryland

Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.