Hard water in Morris Plains, NJ
Reported by Southeast Morris County MUA · October 2025
- NJ typical
- 80 mg/L
- EPA health violations since 2016
- 2
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Morris Plains has about 148 mg/L of hardness, which is 8.7 grains per gallon. On the USGS scale that counts as hard. The number comes from Southeast Morris County MUA, dated October 2025.
At 148 mg/L, Morris Plains is 68 mg/L above the typical New Jersey figure of 80. Of the 10 nearest cities we track, 4 have softer water and 4 have harder. The range nearby runs from 92 mg/L in Boonton to 269 in White Meadow Lake.
What 148 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 148 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 × 8.7 gpg = 1,946 grains a day. A 24,000-grain unit regenerates about every 12 days.
EPA record for Morris Plains's water system
2 health-based violations since 2016
Serves about 62,349 people from surface water.
- Health-based
- 2
- Monitoring or reporting
- 54
- Open now
- 0
TapWaterData ties Morris Plains to this system. EPA's service-area records do not name Morris Plains, so check the utility printed on your water bill.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Total trihalomethanes (TTHM)a disinfection byproduct | 2 | 2018 | Resolved |
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 Morris Plains water hard?
Yes. It measures about 148 mg/L (8.7 grains per gallon), which the USGS classes as hard.
What is the water hardness in Morris Plains in grains per gallon?
About 8.7 gpg. One grain per gallon equals 17.1 mg/L, so 148 mg/L divided by 17.1 gives 8.7.
What size water softener do I need in Morris Plains?
For 3 people using 75 gallons each per day, 8.7 gpg works out to about 1,946 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.
Has the Morris Plains water system had EPA violations?
EPA records show 2 health-based violations for Southeast Morris County MUA since 2016, involving Total trihalomethanes (TTHM). There were also 54 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Morristown148 mg/LHard
- Whippany148 mg/LHard
- Parsippany208 mg/LVery hard
- Troy Hills208 mg/LVery hard
- Rockaway123 mg/LHard
- Lake Hiawatha208 mg/LVery hard
- Boonton92 mg/LModerately hard
- Florham Park137 mg/LHard
- White Meadow Lake269 mg/LVery hard
- Madison138 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, October 4, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.