Stoney Chase/ Rock Creek M.h.p.s
EPA ID: MD0070233 · 396 people served · 2 ZIP codes
Five years of EPA monitoring have produced no violations for Stoney Chase/ Rock Creek M.h.p.s — the supplier serving 396 residents has kept every contaminant level within federal limits, a result that places it among the top-performing utilities for systems with a service population of comparable size.
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 1 (2023) to 8 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Stoney Chase/ Rock Creek M.h.p.s Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Stoney Chase/ Rock Creek M.h.p.s serves a community with a median household income of $84,608 and an estimated 45,698 residents across its service area. Approximately 50% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Stoney Chase/ Rock Creek M.h.p.s'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 Cecil County, Maryland 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. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 8 detections recorded. 2 exceed federal EPA limits (4 ppt for PFOA/PFOS). 1 exceeds state limits.
Comparable Water Systems
Similar-sized systems in Maryland
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
Stoney Chase/ Rock Creek M.h.p.s (EPA ID: MD0070233) is a community water system in Maryland that serves approximately 396 people from groundwater sources.
This system provides water to 2 ZIP codes across 1 community.
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
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Stoney Chase/ Rock Creek M.h.p.s (MD0070233) on EPA.gov.
Frequently Asked Questions
Is Stoney Chase/ Rock Creek M.h.p.s water safe to drink?
Based on EPA records, Stoney Chase/ Rock Creek M.h.p.s has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Stoney Chase/ Rock Creek M.h.p.s serve?
Stoney Chase/ Rock Creek M.h.p.s serves approximately 396 people across 2 ZIP codes in Maryland.
Where does Stoney Chase/ Rock Creek M.h.p.s get its water?
The primary water source is groundwater.