New Jersey Water Quality Report
Tap water quality data for 172 cities in New Jersey, updated 2026.
US average: 100 ppm
88 of 172 cities violation-free
172 cities tested
172 water systems tracked
Cleanest Tap Water in New Jersey
Cities with the fewest water quality issues
Lodi Boro-0231
817K served
Montvale Boro-0236
810K served
Hillsdale Boro-0227
809K served
Woodcliff Lake Boro-0268
809K served
Alpine Boro-0202
793K served
Bergenfield Boro-0203
793K served
Bogota Boro-0204
793K served
Carlstadt Boro-0205
793K served
Cliffside Park Boro-0206
793K served
Closter Boro-0207
793K served
Most Water Quality Issues in New Jersey
Cities with the most violations and concerns
Mount Olive Twp.-1427
245K served
Hopewell Twp.1106-
218K served
Hamilton Twp.-1103
256K served
Lawrence Twp.-1107
227K served
Ewing Twp.-1102
217K served
Trenton City-1111
217K served
Keansburg Boro-1321
388K served
Egg Harbor Twp-0108
122K served
East Orange City-0705
369K served
Moorestown Twp.-0322
285K served
Water Hardness Across New Jersey
Not sure what your hardness means? Use our Water Hardness Calculator or find the best hardness test kits.
New Jersey Tap Water: What You Need to Know
New Jersey has 172 tracked water utilities serving approximately 78.2M residents. The average water hardness is 89 ppm (5.2 GPG), classified as Moderately Hard — below the national average of 100 ppm. Hardness ranges from 9.4 ppm in Voorhees Twp.-0434 to 281 ppm in Jersey City-0906.
In the past 3 years, 84 of 172 cities in New Jersey have recorded water quality violations, totaling 2570 violations (63 health-based). All 172 tested cities have lead levels below the EPA action level of 15 ppb.
Frequently Asked Questions About New Jersey Water
Is tap water safe to drink in New Jersey?
Most tap water in New Jersey meets EPA standards, but 84 cities have recorded violations in the past 3 years (63 health-based). We recommend checking your specific city's report on TapWater.org and considering a home water test.
How hard is the water in New Jersey?
New Jersey's average water hardness is 89 ppm (5.2 GPG), classified as Moderately Hard. This is below the national average of 100 ppm. Hardness varies significantly by city — use our Water Hardness Calculator to check your specific area.
Which city in New Jersey has the cleanest tap water?
Based on EPA violation data, lead testing, and water quality metrics, Lodi Boro-0231 ranks as having the cleanest tap water in New Jersey. It has zero violations in the past 3 years.
Which city in New Jersey has the most water quality issues?
Mount Olive Twp.-1427 currently has the most water quality concerns in New Jersey, with 347 violations in the past 3 years. Residents should check their city's detailed water quality report and consider using a certified water filter.
Where does New Jersey get its water from?
The majority of New Jersey's water systems (83%) use surface water as their primary source. Surface water comes from rivers, lakes, and reservoirs. Each city's specific source can vary — check individual city reports for details.
48 of 172 Cities
Sorted by population served
Lodi Boro-0231
Utility serves 817K
Montvale Boro-0236
Utility serves 810K
Hillsdale Boro-0227
Utility serves 809K
Woodcliff Lake Boro-0268
Utility serves 809K
Wallington Boro-0265
Utility serves 804K
Alpine Boro-0202
Utility serves 793K
Bergenfield Boro-0203
Utility serves 793K
Bogota Boro-0204
Utility serves 793K
Carlstadt Boro-0205
Utility serves 793K
Cliffside Park Boro-0206
Utility serves 793K
Closter Boro-0207
Utility serves 793K
Cresskill Boro-0208
Utility serves 793K
Demarest Boro-0209
Utility serves 793K
Dumont Boro-0210
Utility serves 793K
East Rutherford Boro-0212
Utility serves 793K
Edgewater Boro-0213
Utility serves 793K
Emerson Boro-0214
Utility serves 793K
Englewood City-0215
Utility serves 793K
Englewood Cliffs Boro-0216
Utility serves 793K
Fairview Boro-0218
Utility serves 793K
Fort Lee Boro-0219
Utility serves 793K
Guttenberg Town-0903
Utility serves 793K
Hackensack City-0223
Utility serves 793K
Harrington Park Boro-0224
Utility serves 793K
Hasbrouck Heights-0225
Utility serves 793K
Haworth Boro-0226
Utility serves 793K
Leonia Boro-0229
Utility serves 793K
Little Ferry Boro-0230
Utility serves 793K
Maywood Boro-0234
Utility serves 793K
Moonachie Boro-0237
Utility serves 793K
New Milford Boro-0238
Utility serves 793K
North Bergen Twp.-0908
Utility serves 793K
Northvale Boro-0240
Utility serves 793K
Norwood Boro-0241
Utility serves 793K
Old Tappan Boro-0243
Utility serves 793K
Oradell Boro-0244
Utility serves 793K
Palisades Park Boro-0245
Utility serves 793K
Paramus Boro-0246
Utility serves 793K
Ridgefield Boro-0249
Utility serves 793K
Ridgefield Park Twp-0250
Utility serves 793K
River Edge Boro-0252
Utility serves 793K
River Vale Twp-0253
Utility serves 793K
Rochelle Park Twp-0254
Utility serves 793K
Rockleigh Boro-0255
Utility serves 793K
Rutherford Boro-0256
Utility serves 793K
Secaucus Town-0909
Utility serves 793K
South Hackensack Twp-.0259
Utility serves 793K
Teaneck Twp-.0260
Utility serves 793K