Robertsville, NJ water hardness

Tap water hardness
29mg/L
1.7gpg
Soft

Reported by Marlboro Township Water Utility Division · September 2025

NJ typical
80 mg/L
EPA health violations since 2016
2
Data
Utility report

The water in Robertsville carries roughly 29 mg/L of dissolved calcium and magnesium, or 1.7 grains per gallon. That is soft water. The number comes from Marlboro Township Water Utility Division, dated September 2025.

Robertsville on the hardness scale, with nearby cities
060120180240300360+NJ typical 80Morganville: 29 mg/LMorganville 29Matawan: 59 mg/LMatawan 59East Freehold: 64 mg/LEast Freehold 64Freehold: 64 mg/LFreehold 64Strathmore: 64 mg/LStrathmore 64West Freehold: 64 mg/LWest Freehold 64Old Bridge: 69 mg/LOld Bridge 69Madison Park: 69 mg/LMadison Park 69Laurence Harbor: 69 mg/LLaurence Harbor 69Yorketown: 91 mg/LYorketown 91Robertsville 29mg/L as calcium carbonate060120180240300360+NJ 80Morganville: 29 mg/LMorganville 29East Freehold: 64 mg/LEast Freeh. 64Freehold: 64 mg/LFreehold 64Strathmore: 64 mg/LStrathmore 64Old Bridge: 69 mg/LOld Bridge 69Yorketown: 91 mg/LYorketown 9129 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Robertsville sits 51 mg/L below the typical New Jersey figure of 80. None of the 10 nearest cities we track has softer water. The range nearby runs from 29 mg/L in Morganville to 91 in Yorketown.

What 29 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

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

Nothing, as far as hardness goes. At 29 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Robertsville's water system

Marlboro Township Water Utility Division · PWSID NJ1328002

2 health-based violations since 2016

Serves about 29,480 people from surface water.

Health-based
2
Monitoring or reporting
18
Open now
0

TapWaterData ties Robertsville to this system. EPA's service-area records do not name Robertsville, so check the utility printed on your water bill.

20162017201820192020202120222023202420252026Haloacetic acids (HAA5)'16'18'20'22'24'26Haloacetic acids (HAA5)
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Haloacetic acids (HAA5)a disinfection byproduct22016Resolved

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 Robertsville water hard?

No. It measures about 29 mg/L (1.7 grains per gallon), which the USGS classes as soft.

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

About 1.7 gpg. One grain per gallon equals 17.1 mg/L, so 29 mg/L divided by 17.1 gives 1.7.

Has the Robertsville water system had EPA violations?

EPA records show 2 health-based violations for Marlboro Township Water Utility Division since 2016, involving Haloacetic acids (HAA5). There were also 18 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, September 22, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.