Backflow Laws: New Jersey
New Jersey Backflow Prevention Laws, Regulations, and Compliance Requirements
New Jersey has one of the most technically detailed backflow prevention regulatory frameworks in the nation. The NJDEP Division of Water Supply and Geoscience administers the Physical Connection program under N.J.A.C. 7:10, which not only requires annual pressure testing but also mandates an internal inspection (dismantling) of DCVA and RPZ assemblies at least once every six months prior to permit renewal. NJ also requires a Physical Connection Permit for all approved backflow installations — a permit-based model unusual among U.S. states. Testers must be NJDEP-certified. This guide covers New Jersey's regulatory framework and programs for NJ American Water, Newark Water, and major NJ utilities.
New Jersey State Regulatory Framework
New Jersey’s backflow prevention requirements are established in the New Jersey Safe Drinking Water Act and the New Jersey Administrative Code at N.J.A.C. 7:10 (specifically Subchapter 10 — Physical Connections), administered by the NJDEP Division of Water Supply and Geoscience. NJDEP holds EPA primacy under the federal Safe Drinking Water Act. Additionally, the NJ Uniform Construction Code at N.J.A.C. 5:23-2.23(I)4 requires that testable backflow preventers be field-tested when installed and re-tested annually.
New Jersey’s Physical Connection program operates on a permit basis: approved physical connection installations (backflow prevention assemblies) require a Physical Connection Permit from NJDEP. This permit-based model creates a documented registry of all approved backflow prevention installations in New Jersey. Applications, renewals, and test reports use NJDEP-specified forms including the Quarterly Physical Connection Test and Maintenance Report form.
New Jersey's Distinctive Testing Requirements
N.J.A.C. 7:10-10.6 establishes New Jersey’s testing requirements, which are more comprehensive than most U.S. states:
Annual pressure testing: All backflow prevention assemblies must be pressure-tested at least annually. Testing must be performed by a NJDEP-certified tester. Results are recorded on the Quarterly Physical Connection Test and Maintenance Report form and submitted to NJDEP.
Internal inspection: At least once every six months prior to the submission of a permit renewal application, an internal inspection must be conducted. The internal inspection requires dismantling of the DCVA or RPZ assembly to visually inspect the integrity of internal mechanisms including clappers, discs, and facing rings. After reassembly, the device must be tested for tightness.
Repair window: The owner of a facility must repair and retest within 30 days any approved physical connection installation that fails a pressure test or internal inspection. This 30-day repair window applies statewide.
NJDEP-Certified Backflow Tester Requirement
N.J.A.C. 5:23-2.23(I)4 and N.J.A.C. 7:10 require that testing be performed by an individual certified by an agency recognized by the NJDEP’s Bureau of Safe Drinking Water. NJDEP publishes a list of Certified Backflow Prevention Device Testers. Cherry Hill Township’s local requirements explicitly state that an individual certified by an NJDEP-recognized agency must perform testing. Once certified, the original Certification for each device tested must be filed with the local Township’s Code Enforcement Office or the local water authority. Some municipalities issue a Certificate of Compliance (e.g., Cherry Hill: $25 fee, valid for one year, annually renewable).
New Jersey's Internal Inspection Requirement — Mandatory Disassembly
Unlike virtually all other U.S. states where ‘annual testing’ means a field pressure test using a differential gauge, New Jersey additionally requires a mandatory internal inspection — the physical dismantling of the assembly to visually inspect the integrity of internal components. This internal inspection must occur within six months prior to permit renewal, making it effectively a semi-annual obligation on top of annual pressure testing. Property owners in New Jersey must budget for the time and cost of periodic full disassembly and reassembly by a qualified tester.
Major Water Purveyors in New Jersey
New Jersey American Water (NJAW)
New Jersey American Water is the largest water utility in New Jersey, serving over 600,000 customer accounts across the state in approximately 100 communities. NJAW’s cross-connection control program covers commercial, industrial, and residential customers with cross-connection hazards. NJAW uses its Commercial Customer Survey Form to assess the need for cross-connection control devices at commercial locations. In low-hazard situations, NJAW may allow residential dual-check devices. NJAW’s Cross Connection Team can be reached at NJAW.CrossConnection@amwater.com or 848-232-8309. Failure to comply can result in water service disconnection after repeated requests from NJAW’s Cross Connection Department.
Newark Department of Water and Sewer Utilities
Newark’s water system serves New Jersey’s largest city. Newark’s cross-connection program operates under NJDEP N.J.A.C. 7:10 requirements and the NJ Uniform Construction Code. Annual testing by NJDEP-certified testers is required. Given Newark’s significant industrial and commercial base, cross-connection control is a priority area.
Jersey City Municipal Utilities Authority (JCMUA)
Jersey City MUA serves Hudson County’s largest city in the New York Metro area. Cross-connection requirements aligned with N.J.A.C. 7:10 apply. Annual testing and internal inspection requirements apply statewide.
Middlesex Water Company
Middlesex Water Company serves Middlesex County and surrounding areas. Middlesex Water’s cross-connection control program requires annual testing by NJDEP-certified testers. Middlesex County is one of New Jersey’s most populous counties with significant commercial, industrial, and residential cross-connection compliance activity.
Municipal Utilities Authorities (MUAs) Statewide
New Jersey has dozens of Municipal Utilities Authorities operating water supply systems. Each operates cross-connection control programs under NJDEP oversight and N.J.A.C. 7:10. Many municipalities add a local Certificate of Compliance layer (like Cherry Hill’s $25 annual certificate) on top of the NJDEP permit requirements.
New Jersey Certificate of Compliance — A Local Layer on Top of NJDEP Requirements
Many New Jersey municipalities impose a local Certificate of Compliance requirement on top of the NJDEP Physical Connection Permit requirements. These local certificates (such as Cherry Hill’s $25 annual certificate issued by the Township’s Code Enforcement Office) create an additional compliance obligation and fee. Property owners must confirm whether their specific municipality requires a local certificate in addition to NJDEP test report submission — failure to obtain the local certificate, even with timely NJDEP reporting, may result in a compliance notice from the municipality.
Property Owner Compliance Summary for New Jersey
NJDEP Physical Connection Permit: All approved backflow prevention installations require a Physical Connection Permit from NJDEP.
NJDEP-certified tester: Annual pressure testing by agency recognized by NJDEP’s Bureau of Safe Drinking Water.
Internal inspection: Mandatory disassembly and visual inspection required within 6 months prior to permit renewal.
30-day repair window: Repair and retest within 30 days of any failed pressure test or internal inspection.
Local certificate: Confirm with your municipality whether a local Certificate of Compliance is required in addition to NJDEP reporting.
Records: Test results on NJDEP’s Quarterly Physical Connection Test and Maintenance Report form; records kept for at least 3 years.
Find a Certified Backflow Tester in New Jersey
Find NJDEP-certified backflow prevention device testers at getyourbackflowtested.com/backflow-testing-near-me/new-jersey-backflow-testing or through NJDEP’s certified tester list at dep.nj.gov — covering Newark, Jersey City, Trenton, Camden, Cherry Hill, and all NJ communities.
New Jersey Regulatory Reference Links
| Resource / Agency | URL / Link Target |
|---|---|
NJDEP — Physical Connection Permit Processing | |
NJDEP — Certified Backflow Prevention Device Testers | |
N.J.A.C. 7:10-10.3 — Approved Physical Connection Installation Requirements | |
N.J.A.C. 7:10-10.6 — Inspection and Testing Requirements | |
NJ American Water — Cross Connection and Backflow Prevention | |
Cherry Hill Township — Backflow Preventers |