Full data table
This is the complete set of records currently published — 160 municipalities, all in New Jersey while the state rollout is completed. Values are exactly as reported by the serving utility; conversions between mg/L and grains per gallon use the standard factor of 17.1 mg/L per grain. Blank hardness fields mean the figure has not yet been read from a source document.
160 of 160 records
| mg/L | Class | Source | ||||
|---|---|---|---|---|---|---|
| Aberdeen | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Allenhurst Borough | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Asbury Park City | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Atlantic Highlands | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Audubon | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Audubon Park | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Avon | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Barrington | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Bay Head | Ocean | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Bayonne | Hudson | 3 | 52 | Slightly Hard | Veolia Bayonne Service System | Veolia Bayonne CCR 2024 |
| Beasleys Point | Cape May | 5.1 | 88 | Moderately Hard | Ocean City Service System | NJ American Water CCR |
| Bedminster | Somerset | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Belmar | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Belvidere | Warren | 15.4 | 263 | Very Hard | Belvidere System | NJ American Water CCR |
| Berkeley Heights | Union | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Bernards (Basking Ridge) | Somerset | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Bernardsville | Somerset | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Beverly | Burlington | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Bloomfield | Essex | 2.6 | 44 | Slightly Hard | Bloomfield Township municipal system | Bloomfield Twp CCR 2024 |
| Bradley Beach | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Bridgeport | Gloucester | 7.4 | 126 | Hard | Bridgeport System | NJ American Water CCR |
| Carneys Point Township | Salem | 6.7 | 115 | Moderately Hard | Penns Grove Service System | NJ American Water CCR |
| Cedar Grove | Essex | 3.7 | 64 | Moderately Hard | Little Falls Service System | NJ American Water CCR |
| Chatham Borough | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Chatham Township | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Cherry Hill | Camden | 7.5 | 128 | Hard | Western Service System | NJ American Water CCR |
| Chester Borough | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Cinnaminson | Burlington | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Clifton | Passaic | 4.7 | 81 | Moderately Hard | PVWC system | Passaic Valley Water Commission CCR |
| Colts Neck | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Country Oaks (Mount Olive Twp) | Morris | 9.6 | 164 | Hard | ITC/County Oaks Service System | NJ American Water CCR |
| Cream Ridge | Monmouth | 5.6 | 96 | Moderately Hard | Deep Run Service System | NJ American Water CCR |
| Crossroads at Oldwick | Hunterdon | 13 | 222 | Very Hard | Crossroads at Oldwick System | NJ American Water CCR |
| Deal | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Delanco | Burlington | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Delran | Burlington | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| East Hanover | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| East Orange | Essex | 25.9 | 442 | Very Hard | East Orange municipal system | City of East Orange CCR |
| Eastampton | Burlington | 6.9 | 119 | Moderately Hard | Mount Holly Service System | NJ American Water CCR |
| Eatontown | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Edgewater Park | Burlington | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Elberon | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Elizabeth | Union | 5.4 | 93 | Moderately Hard | Liberty Service System | NJ American Water CCR |
| Essex Fells | Essex | 7.6 | 130 | Hard | Essex Fells Water Utility (PWSID NJ0706001) | Borough of Essex Fells Water Department |
| Fair Haven | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Far Hills | Somerset | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Florham Park | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Four Seasons at Chester | Morris | 18.3 | 313 | Very Hard | Four Seasons at Chester System | NJ American Water CCR |
| Frenchtown | Hunterdon | 10.4 | 178 | Hard | Frenchtown System | NJ American Water CCR |
| Gibbsboro | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Gloucester City | Camden | 5.7 | 97 | Moderately Hard | Gloucester City municipal system | City of Gloucester CCR |
| Haddon Heights | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Haddonfield | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Hainesport | Burlington | 6.9 | 119 | Moderately Hard | Mount Holly Service System | NJ American Water CCR |
| Harding | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Harrison | Hudson | 8.2 | 140 | Hard | Harrison System | NJ American Water CCR |
| Hazlet | Monmouth | 4.3 | 74 | Moderately Hard | Shorelands Service System | NJ American Water CCR |
| Hi-Nella | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Highlands | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Hillside | Union | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Holmdel | Monmouth | 4.3 | 74 | Moderately Hard | Shorelands Service System | NJ American Water CCR |
| Howell | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Interlaken | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| International Trade Center (Mount Olive Twp) | Morris | 9.6 | 164 | Hard | ITC/County Oaks Service System | NJ American Water CCR |
| Irvington | Essex | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Jackson | Ocean | 5 | 86 | Moderately Hard | Jackson Township MUA | Jackson Township MUA CCR 2024 |
| Jersey City | Hudson | 4.8 | 83 | Moderately Hard | Veolia Service System | Veolia Jersey City CCR |
| Keansburg | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Kenvil | Morris | 9.9 | 169 | Hard | Roxbury Service System | NJ American Water CCR |
| Lake Como | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Lakewood | Ocean | 5.9 | 100 | Moderately Hard | Lakewood municipal system | Lakewood Water Quality Report |
| Landing | Morris | 9.9 | 169 | Hard | Roxbury Service System | NJ American Water CCR |
| Laurel Springs | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Lawnside | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Ledgewood | Morris | 9.9 | 169 | Hard | Roxbury Service System | NJ American Water CCR |
| Lindenwold | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Little Falls | Passaic | 3.7 | 64 | Moderately Hard | Little Falls System | NJ American Water CCR |
| Little Silver | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Livingston | Essex | 19.4 | 332 | Very Hard | Township of Livingston Water (PWSID NJ0710001) | Township of Livingston 2025 Water Quality Report (2024 data) |
| Loch Arbour Village | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Logan Township | Gloucester | 7.4 | 126 | Hard | Bridgeport System | NJ American Water CCR |
| Long Branch City | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Long Hill Township | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Lumberton | Burlington | 6.9 | 119 | Moderately Hard | Mount Holly Service System | NJ American Water CCR |
| Madison | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Magnolia | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Mahwah | Bergen | 14.6 | 250 | Very Hard | Mahwah municipal system | Mahwah Water Quality Report |
| Mansfield | Burlington | 18.9 | 323 | Very Hard | Washington Service System | NJ American Water CCR |
| Maplewood | Essex | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Marmora | Cape May | 5.1 | 88 | Moderately Hard | Ocean City Service System | NJ American Water CCR |
| Matawan | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Mendham | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Mendham Township | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Middletown | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Millburn (Short Hills) | Essex | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Monmouth Beach | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Montclair | Essex | 20.5 | 350 | Very Hard | Montclair Water Bureau (PWSID NJ0713001) | Montclair Water Bureau Consumer Confidence Report 2025 |
| Morris (Township/Plains area) | Morris | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Mount Ephraim | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Mount Holly | Burlington | 6.9 | 119 | Moderately Hard | Mount Holly System | NJ American Water CCR |
| Mount Olive | Morris | 9.4 | 160 | Hard | Mount Olive/West Jersey System | NJ American Water CCR |
| Mullica Hill | Gloucester | 8.2 | 140 | Hard | Harrison System | NJ American Water CCR |
| Neptune City | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Neptune Township | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| New Egypt | Ocean | 6 | 102 | Moderately Hard | New Egypt System | NJ American Water CCR |
| New Providence | Union | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Newark | Essex | 2.7 | 46 | Slightly Hard | Newark municipal system | City of Newark CCR (2020 data) |
| North Bergen | Hudson | 8.8 | 150 | Hard | North Jersey District Water Supply | NJ District Water Supply Commission CCR |
| Oaklyn | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Ocean City | Cape May | 5.1 | 88 | Moderately Hard | Ocean City System | NJ American Water CCR |
| Ocean Grove | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Ocean Township | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Oceanport | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Orange | Essex | 14.3 | 245 | Very Hard | Orange municipal system | City of Orange CCR 2025 |
| Oxford | Warren | 18.9 | 323 | Very Hard | Washington Service System | NJ American Water CCR |
| Palmyra | Burlington | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Paramus | Bergen | 8 | 136 | Hard | Veolia Hackensack Service System | Veolia Hackensack CCR |
| Parsippany-Troy Hills | Morris | 21.1 | 361 | Very Hard | Parsippany-Troy Hills municipal system | Parsippany Twp CCR 2025 |
| Passaic | Passaic | 4.7 | 81 | Moderately Hard | PVWC system | Passaic Valley Water Commission CCR |
| Paterson | Passaic | 4.7 | 81 | Moderately Hard | PVWC system | Passaic Valley Water Commission CCR |
| Pedricktown | Salem | 6.7 | 115 | Moderately Hard | Penns Grove Service System | NJ American Water CCR |
| Penns Grove | Salem | 6.7 | 115 | Moderately Hard | Penns Grove System | NJ American Water CCR |
| Perth Amboy | Middlesex | 4.6 | 79 | Moderately Hard | Middlesex Water Company system | Middlesex Water Company CCR 2025 |
| Port Morris | Morris | 9.9 | 169 | Hard | Roxbury Service System | NJ American Water CCR |
| Repaupo | Gloucester | 7.4 | 126 | Hard | Bridgeport System | NJ American Water CCR |
| Riverside | Burlington | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Riverton | Burlington | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Roseland | Essex | 7.6 | 130 | Hard | Roseland Water Department (PWSID NJ0718001) | Borough of Roseland 2025 Annual Drinking Water Quality Report; Borough of Essex Fells water department |
| Rumson | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Runnemede | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Sea Bright | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Shrewsbury | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Shrewsbury Township | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Somerdale | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| South Orange Village | Essex | 9.8 | 168 | Hard | South Orange Village system | South Orange Village CCR |
| Southampton | Burlington | 7 | 120 | Hard | Vincentown Service System | NJ American Water CCR |
| Springfield | Union | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Stewartsville | Warren | 18.9 | 323 | Very Hard | Washington Service System | NJ American Water CCR |
| Stratford | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Succasunna | Morris | 9.9 | 169 | Hard | Roxbury Service System | NJ American Water CCR |
| Summit | Union | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Tinton Falls | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Trenton | Mercer | 4.3 | 74 | Moderately Hard | Trenton Water Works | Trenton Water Works CCR 2024 |
| Union Beach | Monmouth | 5.1 | 88 | Moderately Hard | Union Beach System | NJ American Water CCR |
| Union Township (Union County) | Union | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Verona | Essex | 10.2 | 174 | Hard | Verona Water Department (PWSID NJ0720001) | Township of Verona 2026 Water Quality Report (2025 data) |
| Vincentown | Burlington | 7 | 120 | Hard | Vincentown System | NJ American Water CCR |
| Voorhees Township | Camden | 7.5 | 128 | Hard | Delaware/Western Service System | NJ American Water CCR |
| Wanamassa | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| Warren | Somerset | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Washington | Warren | 18.9 | 323 | Very Hard | Washington Service System | NJ American Water CCR |
| Washington Township (Warren County) | Warren | 18.9 | 323 | Very Hard | Washington Service System | NJ American Water CCR |
| Watchung | Somerset | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Wayne | Passaic | 3 | 52 | Slightly Hard | Wayne Township municipal system | Wayne Township CCR 2025 |
| West Long Branch | Monmouth | 4.8 | 82 | Moderately Hard | Coastal North Service System | NJ American Water CCR |
| West New York | Hudson | 6.6 | 112 | Moderately Hard | Veolia Hackensack Service System | Veolia Hackensack CCR |
| West Orange | Essex | 9.8 | 167 | Hard | Short Hills Service System | NJ American Water CCR |
| Westampton | Burlington | 6.9 | 119 | Moderately Hard | Mount Holly Service System | NJ American Water CCR |
| White Township | Warren | 15.4 | 263 | Very Hard | Belvidere System | NJ American Water CCR |
| Whiting | Ocean | 3.5 | 60 | Moderately Hard | Whiting municipal system | Whiting Water Quality Report |