Middlesex Water Company
EPA ID: NJ1225001 · 233,376 people served · 16 ZIP codes
Based on the latest federal compliance data, Middlesex Water Company has 6 violations that the EPA has not yet closed — those outstanding findings are part of the enforcement record for a utility that delivers water to approximately 233,376 people throughout its service territory.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 8 (2025) to 4 (2026). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Middlesex Water Company Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Middlesex Water Company serves a community with a median household income of $108,841 and an estimated 353,623 residents across its service area. Approximately 78% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Middlesex Water Company's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 1% of homes in Middlesex County, New Jersey rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 90th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
Detected Contaminants
How Middlesex Water Company compares to EPA limits
What This Means For You
Stage 1 DBP Rule at 5 mg/L exceeds the EPA maximum of mg/L.
Contaminant 2946 at 1 mg/L exceeds the EPA maximum of mg/L.
Lead and Copper Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Contaminant 0700 at 1 mg/L exceeds the EPA maximum of mg/L.
Revised Total Coliform Rule at 1 presence exceeds the EPA maximum of presence.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 49 detections recorded. 15 exceed federal EPA limits (4 ppt for PFOA/PFOS). 2 exceed state limits.
Comparable Water Systems
Similar-sized systems in New Jersey
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
MIDDLESEX WATER COMPANY (EPA ID: NJ1225001) is a community water system in New Jersey that serves approximately 233,376 people from surface water sources.
This system provides water to 16 ZIP codes across 14 communities.
Average Home Safety Score: D (53/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| October 1, 2024 | Revised Total Coliform Rule | Monitoring | Unresolved |
| July 1, 2024 | Stage 1 DBP Rule | Monitoring | Unresolved |
| July 1, 2023 | Contaminant 2946 | Monitoring | Unresolved |
| July 1, 2023 | Stage 1 DBP Rule | Monitoring | Unresolved |
| May 1, 2023 | Contaminant 0700 | Monitoring | Unresolved |
| April 1, 2023 | Stage 1 DBP Rule | Monitoring | Resolved |
| January 1, 2023 | Stage 1 DBP Rule | Monitoring | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Stage 1 DBP Rule | Treatment Failure | 5 | No |
| Contaminant 2946 | Other Violation | 1 | No |
| Lead and Copper Rule | Treatment Failure | 1 | No |
| Contaminant 0700 | Other Violation | 1 | No |
| Revised Total Coliform Rule | Microbiological | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 08830 | 0.001 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by NJ or modeled from parcel and building-footprint data.
- 07001 — Avenel
- 07008 — Carteret
- 07064 — Port Reading
- 07067 — Colonia
- 07077 — Sewaren
- 07080 — South Plainfield
- 07095 — Woodbridge
- 08817 — Edison
- 08820 — Edison
- 08830 — Iselin
- 08832 — Keasbey
- 08837 — Edison
- 08840 — Metuchen
- 08861 — Perth Amboy
- 08863 — Fords
- 08879 — South Amboy
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Middlesex Water Company (NJ1225001) on EPA.gov.
Frequently Asked Questions
Is Middlesex Water Company water safe to drink?
Middlesex Water Company has only monitoring/reporting violations, which are procedural in nature. The system meets federal health-based standards.
How many people does Middlesex Water Company serve?
Middlesex Water Company serves approximately 233,376 people across 16 ZIP codes in New Jersey.
Where does Middlesex Water Company get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: NJDEP Public Community Water Purveyor SLI · Submitted 2024
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
- #32 / 50 Highest Exposure Burden (New Jersey)
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Middlesex Water Company (EPA ID: NJ1225001) — request the latest Consumer Confidence Report or ask about specific contaminants.