Siasconset Water Department
EPA ID: MA4197001 · 3,000 people served · 3 ZIP codes
In every reporting cycle over the past five years, Siasconset Water Department has come through without a single EPA violation — a consistent performance across the full service population of approximately 3,000 residents that reflects both well-maintained infrastructure and reliable operational oversight.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Siasconset Water Department Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Siasconset Water Department serves a community with a median household income of $125,524 and an estimated 14,299 residents across its service area. Approximately 56% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Siasconset Water Department'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 Nantucket County, Massachusetts rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
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
Siasconset Water Department (EPA ID: MA4197001) is a community water system in Massachusetts that serves approximately 3,000 people from groundwater sources.
This system provides water to 3 ZIP codes across 2 communities.
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: 2 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 1 additional ZIP inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Siasconset Water Department (MA4197001) on EPA.gov.
Frequently Asked Questions
Is Siasconset Water Department water safe to drink?
Based on EPA records, Siasconset Water Department has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Siasconset Water Department serve?
Siasconset Water Department serves approximately 3,000 people across 3 ZIP codes in Massachusetts.
Where does Siasconset Water Department get its water?
The primary water source is groundwater.
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.