How hard is the water in Milltown, NJ?

Tap water hardness
66mg/L
3.9gpg
Moderately hard

Reported by Milltown W Dept · December 2024

NJ typical
80 mg/L
EPA health violations since 2016
14
Softener for 3 people
24k grain
Data
Utility report

Milltown water measures 66 mg/L (3.9 gpg) of hardness, moderately hard by USGS standards. The number comes from Milltown W Dept, dated December 2024.

Milltown on the hardness scale, with nearby cities
060120180240300360+NJ typical 80Highland Park: 63 mg/LHighland Park 63New Brunswick: 66 mg/LNew Brunswick 66Sayreville: 66 mg/LSayreville 66Old Bridge: 69 mg/LOld Bridge 69Dayton: 82 mg/LDayton 82Rutgers University-Busch Campus: 100 mg/LRutgers University-Busch Campus 100Jamesburg: 100 mg/LJamesburg 100Somerset: 169 mg/LSomerset 169East Franklin: 235 mg/LEast Franklin 235Franklin Park: 235 mg/LFranklin Park 235Milltown 66mg/L as calcium carbonate060120180240300360+NJ 80Highland Park: 63 mg/LHighland P. 63New Brunswick: 66 mg/LNew Brunsw. 66Rutgers University-Busch Campus: 100 mg/LRutgers Un. 100Somerset: 169 mg/LSomerset 169East Franklin: 235 mg/LEast Frank. 235Franklin Park: 235 mg/LFranklin P. 23566 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 66 mg/L, Milltown is 14 mg/L below the typical New Jersey figure of 80. Of the 10 nearest cities we track, 1 has softer water and 7 have harder. The range nearby runs from 63 mg/L in Highland Park to 235 in East Franklin.

What 66 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 Milltown

3 people × 75 gallons a day × 3.9 gpg = 871 grains a day. A 24,000-grain unit regenerates about every 27 days.

Size it for your household

EPA record for Milltown's water system

Milltown W Dept · PWSID NJ1212001

14 health-based violations since 2016

Serves about 7,000 people from surface water.

Health-based
14
Monitoring or reporting
20
Open now
0
20162017201820192020202120222023202420252026Total trihalomethanes (TTHM)Lead and Copper RuleSurface Water Treatment Rule'16'18'20'22'24'26Total trihalomethanes (TTHM)Lead and Copper RuleSurface Water Treatment Rule
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Total trihalomethanes (TTHM)a disinfection byproduct82024–2026Resolved
Lead and Copper Rulecorrosion control and lead sampling42017–2025Resolved
Surface Water Treatment Rulefiltration and disinfection22024–2025Resolved

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 Milltown water hard?

Somewhat. It measures about 66 mg/L (3.9 grains per gallon), which the USGS classes as moderately hard.

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

About 3.9 gpg. One grain per gallon equals 17.1 mg/L, so 66 mg/L divided by 17.1 gives 3.9.

What size water softener do I need in Milltown?

For 3 people using 75 gallons each per day, 3.9 gpg works out to about 871 grains a day. A 24,000-grain softener covers that with a regeneration about every 27 days.

Has the Milltown water system had EPA violations?

EPA records show 14 health-based violations for Milltown W Dept since 2016, involving Total trihalomethanes (TTHM), Lead and Copper Rule, Surface Water Treatment Rule. There were also 20 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 227 cities in New Jersey

Hardness data: TapWaterData US Water Hardness (utility report, December 22, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.