Morris County water hardness
Morris County has some of the hardest water in New Jersey. Wells drawing on glacial valley-fill and carbonate bedrock push several systems past 20 grains per gallon.
Across the 21 Morris County municipalities with published figures, hardness averages 10.7 grains per gallon — very hard water on the USGS scale. Because most towns here buy treated water rather than produce it, neighbouring municipalities on the same system report the same number; the systems represented below are Short Hills Service System, ITC/County Oaks Service System, Four Seasons at Chester System, Roxbury Service System, Mount Olive/West Jersey System, among others.
21 of 21 records
| mg/L | Class | Source | |||
|---|---|---|---|---|---|
| Chatham Borough | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Chatham Township | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Chester Borough | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Country Oaks (Mount Olive Twp) | 9.6 | 164 | Hard | ITC/County Oaks Service System | NJ American Water CCR |
| East Hanover | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Florham Park | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Four Seasons at Chester | 18.3 | 313 | Very Hard | Four Seasons at Chester System | NJ American Water CCR |
| Harding | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| International Trade Center (Mount Olive Twp) | 9.6 | 164 | Hard | ITC/County Oaks Service System | NJ American Water CCR |
| Kenvil | 9.9 | 169 | Hard | Roxbury Service System | NJ American Water CCR |
| Landing | 9.9 | 169 | Hard | Roxbury Service System | NJ American Water CCR |
| Ledgewood | 9.9 | 169 | Hard | Roxbury Service System | NJ American Water CCR |
| Long Hill Township | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Madison | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Mendham | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Mendham Township | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Morris (Township/Plains area) | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Mount Olive | 9.4 | 160 | Hard | Mount Olive/West Jersey System | NJ American Water CCR |
| Parsippany-Troy Hills | 21.1 | 361 | Very Hard | Parsippany-Troy Hills municipal system | Parsippany Twp CCR 2025 |
| Port Morris | 9.9 | 169 | Hard | Roxbury Service System | NJ American Water CCR |
| Succasunna | 9.9 | 169 | Hard | Roxbury Service System | NJ American Water CCR |
Every Morris County town page
Each municipality has its own page with the reported figure, the system that supplies it, what the level means in practice locally, and the report the number was read from.
- Chatham Borough water hardness — 9.8 gpg, hard9.8 gpg
- Chatham Township water hardness — 9.8 gpg, hard9.8 gpg
- Chester Borough water hardness — 9.8 gpg, hard9.8 gpg
- Country Oaks (Mount Olive Twp) water hardness — 9.6 gpg, hard9.6 gpg
- East Hanover water hardness — 9.8 gpg, hard9.8 gpg
- Florham Park water hardness — 9.8 gpg, hard9.8 gpg
- Four Seasons at Chester water hardness — 18.3 gpg, very hard18.3 gpg
- Harding water hardness — 9.8 gpg, hard9.8 gpg
- International Trade Center (Mount Olive Twp) water hardness — 9.6 gpg, hard9.6 gpg
- Kenvil water hardness — 9.9 gpg, hard9.9 gpg
- Landing water hardness — 9.9 gpg, hard9.9 gpg
- Ledgewood water hardness — 9.9 gpg, hard9.9 gpg
- Long Hill Township water hardness — 9.8 gpg, hard9.8 gpg
- Madison water hardness — 9.8 gpg, hard9.8 gpg
- Mendham water hardness — 9.8 gpg, hard9.8 gpg
- Mendham Township water hardness — 9.8 gpg, hard9.8 gpg
- Morris (Township/Plains area) water hardness — 9.8 gpg, hard9.8 gpg
- Mount Olive water hardness — 9.4 gpg, hard9.4 gpg
- Parsippany-Troy Hills water hardness — 21.1 gpg, very hard21.1 gpg
- Port Morris water hardness — 9.9 gpg, hard9.9 gpg
- Succasunna water hardness — 9.9 gpg, hard9.9 gpg
The extremes in Morris County are Parsippany-Troy Hills water hardness at 21.1 gpg and Mount Olive at 9.4 gpg.