TTHM (Total Trihalomethanes) violations in New Jersey
75 active public water systems in New Jersey had a TTHM (Total Trihalomethanes) violation in the past three years, 11 of them still unresolved. What TTHM (Total Trihalomethanes) is and why it matters.
Health effects: Long-term exposure is associated with increased bladder cancer risk. Some studies link high TTHM exposure to adverse reproductive outcomes. Bromodichloromethane is classified as a possible human carcinogen.
Systems with a TTHM (Total Trihalomethanes) violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
New Brunswick W Dept New Brunswick City · Middlesex County |
55,000 | 4 | 0 | |
|
Belleville Water Dept Belleville Town · Essex County |
35,129 | 5 | 2 | |
|
Ramsey Water Dept Ramsey Boro · Bergen County |
15,207 | 4 | 0 | |
|
Harrison W Dept Harrison Town · Hudson County |
14,425 | 1 | 1 | |
|
Lincoln Park Water Dept Lincoln Park Boro · Morris County |
11,000 | 4 | 1 | |
|
Boonton Water Dept Boonton Town · Morris County |
9,532 | 4 | 0 | |
|
Pitman Water Department Glassboro Boro, Mantua Twp, Pitman Boro · Gloucester County |
7,896 | 3 | 0 | |
|
Fairfield Water Dept Fairfield Boro · Essex County |
7,400 | 2 | 2 | |
|
Milltown W Dept East Brunswick Twp, Milltown Boro, North Brunswick Twp · Middlesex County |
7,000 | 4 | 0 | |
|
Sussex W Dept Sussex Boro · Sussex County |
2,201 | 4 | 2 | |
|
Hopewell Boro W Dept Hopewell Boro · Mercer County |
2,035 | 4 | 2 | |
|
Wildwood City Water Department Wildwood City · Cape May County |
218,472 | 1 | 0 | |
|
Trenton Water Works Ewing Twp, Hamilton Twp, Hopewell Twp.1106- and 2 more · Mercer County |
217,000 | 8 | 2 | |
|
East Orange Water Commission East Orange City · Essex County |
75,000 | 6 | 1 | |
|
Franklin Township Dept of Public Works Franklin Twp · Somerset County |
57,150 | 3 | 2 | |
|
East Brunswick Water Utility East Brunswick Twp · Middlesex County |
49,715 | 2 | 0 | |
|
Washington Township Mua Washington Twp · Gloucester County |
48,000 | 3 | 0 | |
|
Merchantville Pennsauken Camden City, Cherry Hill Twp, Merchantville Boro and 1 more · Camden County |
47,144 | 4 | 0 | |
|
South Brunswick Twp W DI Franklin Twp, South Brunswick Twp · Middlesex County |
45,450 | 2 | 1 | |
|
Monroe Twp Utility Department Monroe Twp · Middlesex County |
36,000 | 3 | 0 | |
|
Orange Water Dept Orange City · Essex County |
30,134 | 6 | 2 | |
|
Dover Water Commission Dover Town · Morris County |
27,806 | 6 | 2 | |
|
Barnegat Twp Water Sewer Barnegat Twp · Ocean County |
20,000 | 1 | 0 | |
|
Point Pleasant Water Department Point Pleasant Boro · Ocean County |
19,600 | 6 | 0 | |
|
Hawthorne Water Department Fair Lawn Boro, Hawthorne Boro · Bergen County |
19,458 | 3 | 1 | |
|
Park Ridge Water Dept Hillsdale Boro, Montvale Boro, Park Ridge Boro and 2 more · Bergen County |
16,466 | 2 | 1 | |
|
South River W Dept South River Boro · Middlesex County |
16,000 | 6 | 2 | |
|
Madison Water Dept Madison Boro · Morris County |
15,820 | 3 | 1 | |
|
Brigantine Water Department Brigantine City · Atlantic County |
14,450 | 3 | 0 | |
|
Verona Water Department Verona Boro · Essex County |
13,641 | 7 | 2 | |
|
Pemberton Twp Dept Main Pemberton Twp · Burlington County |
12,378 | 6 | 1 | |
|
Manchester Utilities Authority Haledon Boro · Passaic County |
12,000 | 2 | 0 | |
|
Pompton Lakes Mua Pompton Lakes Boro · Passaic County |
11,435 | 6 | 0 | |
|
Beachwood Water Dept Beachwood Boro · Ocean County |
10,802 | 2 | 0 | |
|
Woodbury City W Dept Woodbury City · Gloucester County |
10,263 | 3 | 1 | |
|
Keyport Water Dept Keyport Boro · Monmouth County |
7,500 | 4 | 0 | |
|
Aberdeen Cliffwood/cliffwood Beach Aberdeen Twp · Monmouth County |
6,775 | 3 | 1 | |
|
Resorts Atlantic City Atlantic City · Atlantic County |
5,500 | 3 | 1 | |
|
Allamuchy Twp Water & Sewer Allamuchy Twp · Warren County |
5,423 | 5 | 2 | |
|
Roseland Water Dept Roseland Boro · Essex County |
5,300 | 3 | 0 | |
|
MT Olive Villages Water Mount Olive Twp · Morris County |
5,000 | 11 | 2 | |
|
Woodstown Water Department Mannington Twp, Pilesgrove Twp, Woodstown Boro · Salem County |
4,455 | 4 | 2 | |
|
Netcong Water Dept Netcong Boro · Morris County |
3,342 | 2 | 0 | |
|
Ancora Psychiatric Hospi Winslow Twp · Camden County |
2,506 | 5 | 0 | |
|
Albert C Wagner Youth CO Chesterfield Twp · Burlington County |
2,500 | 6 | 1 | |
|
Aberdeen High School/oakshade Area Aberdeen Twp · Monmouth County |
2,123 | 3 | 1 | |
|
Helmetta Water Dept Helmetta Boro · Middlesex County |
2,000 | 3 | 0 | |
|
Mount Arlington Boro Dpw Main Mount Arlington Boro · Morris County |
1,978 | 4 | 1 | |
|
Kinnelon Water Dept Kinnelon Boro · Morris County |
1,938 | 4 | 1 | |
|
Pemberton Twp High School New Side Pemberton Twp · Burlington County |
1,580 | 4 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The New Jersey records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.