Hard water in Rockaway, NJ
Reported by Rockaway Boro Water Dept · June 2025
- NJ typical
- 80 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in Rockaway carries roughly 123 mg/L of dissolved calcium and magnesium, or 7.2 grains per gallon. That is hard water. The number comes from Rockaway Boro Water Dept, dated June 2025.
At 123 mg/L, Rockaway is 43 mg/L above the typical New Jersey figure of 80. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 37 mg/L in Kinnelon to 269 in White Meadow Lake.
What 123 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 123 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 × 7.2 gpg = 1,618 grains a day. A 24,000-grain unit regenerates about every 14 days.
EPA record for Rockaway's water system
No health-based violations since 2016
Serves about 7,066 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 5
- Open now
- 1
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 Rockaway water hard?
Yes. It measures about 123 mg/L (7.2 grains per gallon), which the USGS classes as hard.
What is the water hardness in Rockaway in grains per gallon?
About 7.2 gpg. One grain per gallon equals 17.1 mg/L, so 123 mg/L divided by 17.1 gives 7.2.
What size water softener do I need in Rockaway?
For 3 people using 75 gallons each per day, 7.2 gpg works out to about 1,618 grains a day. A 24,000-grain softener covers that with a regeneration about every 14 days.
Has the Rockaway water system had EPA violations?
EPA records show no health-based violations for Rockaway Boro Water Dept since 2016. There were also 5 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- White Meadow Lake269 mg/LVery hard
- Wharton43 mg/LSoft
- Morris Plains148 mg/LHard
- Boonton92 mg/LModerately hard
- Parsippany208 mg/LVery hard
- Troy Hills208 mg/LVery hard
- Lake Hiawatha208 mg/LVery hard
- Morristown148 mg/LHard
- Whippany148 mg/LHard
- Kinnelon37 mg/LSoft
Hardness data: TapWaterData US Water Hardness (utility report, June 30, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.