Mattapoisett River Valley W.d.
EPA ID: MA4173001 · 29,600 people served · 1 ZIP code
Federal monitoring records confirm Mattapoisett River Valley W.d. has operated without any EPA violations for the full five-year window — covering every contaminant category and reporting cycle across a service area of approximately 29,600 residents, with no gaps in the compliance record.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Demographics
The Mattapoisett River Valley W.d. serves a community with a median household income of $117,308 and an estimated 6,563 residents across its service area. Approximately 65% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Mattapoisett River Valley W.d.'s water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Plymouth County, Massachusetts 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 60th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Massachusetts
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
Mattapoisett River Valley W.d. (EPA ID: MA4173001) is a community water system in Massachusetts that serves approximately 29,600 people from groundwater sources.
This system serves ZIP code 02739 in Mattapoisett.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
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 note: This system is not yet in the EPA Community Water System Service Area Boundaries v3 dataset, so its service area is derived from SDWIS registry metadata (city of record). Given the system serves 29,600 people, the real service area very likely spans additional ZIP codes that aren't reflected below.
- 02739 — Mattapoisett
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Mattapoisett River Valley W.d. (MA4173001) on EPA.gov.
Frequently Asked Questions
Is Mattapoisett River Valley W.d. water safe to drink?
Based on EPA records, Mattapoisett River Valley W.d. has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Mattapoisett River Valley W.d. serve?
Mattapoisett River Valley W.d. serves approximately 29,600 people across 1 ZIP code in Massachusetts.
Where does Mattapoisett River Valley W.d. get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
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
Utility-reported lead service line presence and tap-sample lead level under federal LCRI requirements:
Below federal action level (0.015 mg/L)
MassDEP reports utility-level presence flag and tap-sampling without per-line breakdown. Customers should inquire with the utility about service line material at a specific address.
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: MassDEP LCRR Service Line Inventory · 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.