Coastal North System water quality
Moderately Hard36 municipalities · Monmouth, Ocean
Coastal North System reports water hardness of 4.8 grains per gallon — 82 mg/L as calcium carbonate, moderately hard on the USGS scale. Because the reading is taken on finished water leaving treatment, it is the figure for all 36 towns on this system rather than for any one of them.
Reported panel
| Hardness (grains per gallon) | 4.8 |
|---|---|
| Hardness (mg/L as CaCO₃) | 82 |
| Classification | Moderately Hard |
| pH | Not reported in CCR |
| Total dissolved solids | Not reported in CCR |
| Disinfectant residual | Chloramine (entry point 0.75-3.50 ppm; distribution avg 1.62 ppm) |
| Sodium | 4.1 to 69.9 ppm (avg ~69.9 max) |
| Chloride | up to 119 ppm |
| Sulfate | up to 29.6 ppm |
| Fluoride | up to 0.52 ppm |
| Manganese | up to 34 ppb |
| Iron | up to 0.31 ppm |
Source: NJ American Water — Coastal North System, 2025 CCR (PWS ID NJ1345001).
Municipalities on this system
- AberdeenMonmouth
- Allenhurst BoroughMonmouth
- Asbury Park CityMonmouth
- Atlantic HighlandsMonmouth
- AvonMonmouth
- Bay HeadOcean
- BelmarMonmouth
- Bradley BeachMonmouth
- Colts NeckMonmouth
- DealMonmouth
- EatontownMonmouth
- ElberonMonmouth
- Fair HavenMonmouth
- HighlandsMonmouth
- HowellMonmouth
- InterlakenMonmouth
- KeansburgMonmouth
- Lake ComoMonmouth
- Little SilverMonmouth
- Loch Arbour VillageMonmouth
- Long Branch CityMonmouth
- MatawanMonmouth
- MiddletownMonmouth
- Monmouth BeachMonmouth
- Neptune CityMonmouth
- Neptune TownshipMonmouth
- Ocean GroveMonmouth
- Ocean TownshipMonmouth
- OceanportMonmouth
- RumsonMonmouth
- Sea BrightMonmouth
- ShrewsburyMonmouth
- Shrewsbury TownshipMonmouth
- Tinton FallsMonmouth
- WanamassaMonmouth
- West Long BranchMonmouth
Questions people ask
- How hard is Coastal North System water?
- Coastal North System reports hardness of 4.8 grains per gallon (82 mg/L as calcium carbonate), which the USGS scale classifies as moderately hard. The figure is a system-wide reading and applies to every municipality on the system.
- Which towns are served by Coastal North System?
- 36 municipalities on file are served by Coastal North System, across Monmouth, Ocean Counties: Aberdeen, Allenhurst Borough, Asbury Park City, Atlantic Highlands, Avon, Bay Head, Belmar, Bradley Beach, Colts Neck, Deal, Eatontown, Elberon, Fair Haven, Highlands, Howell, Interlaken, Keansburg, Lake Como, Little Silver, Loch Arbour Village, Long Branch City, Matawan, Middletown, Monmouth Beach, Neptune City, Neptune Township, Ocean Grove, Ocean Township, Oceanport, Rumson, Sea Bright, Shrewsbury, Shrewsbury Township, Tinton Falls, Wanamassa, West Long Branch.
- Why do towns on Coastal North System publish the same hardness number?
- Hardness is measured at the treatment plant and at entry points to distribution, not street by street. Every town buying finished water from Coastal North System therefore reports the same value.
- How much sodium is in Coastal North System water?
- Coastal North System reports sodium at 4.1 to 69.9 ppm (avg ~69.9 max). That matters for anyone on a sodium-restricted diet, and it is also what rises if an ion-exchange softener is added downstream.
- Do I need a water softener on Coastal North System water?
- At 4.8 gpg, softening is optional — a maintenance and comfort decision rather than a necessary one.
Get your own tap tested
System-wide figures describe finished water leaving the plant. A test at your own tap is what tells you the hardness, iron and pH your plumbing actually sees.
Hardness is a nuisance parameter, not a regulated health contaminant. See the Learn hub for treatment comparisons, or how these figures are sourced.