St. Leonard
EPA ID: MD0040013 · 350 people served · 3 ZIP codes
ZipCheckup's reading of EPA SDWIS for St. Leonard (MD0040013): no EPA violations recorded in the last five years. Although compliance varies widely among water utilities nationally, St. Leonard stands out with zero EPA violations over five consecutive monitoring years, delivering safe tap water to 350 residents and showing no enforcement activity across the entire reporting span.
Data: EPA SDWIS
Service Area Map
Coverage area for St. Leonard Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The St. Leonard serves a community with a median household income of $122,059 and an estimated 30,412 residents across its service area. Approximately 48% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
St. Leonard'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.
Infrastructure Risk
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
St. Leonard (EPA ID: MD0040013) is a community water system in Maryland that serves approximately 350 people from groundwater sources.
This system provides water to 3 ZIP codes across 3 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
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 MD or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for St. Leonard (MD0040013) on EPA.gov.
Frequently Asked Questions
Is St. Leonard water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for St. Leonard in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does St. Leonard serve?
St. Leonard serves approximately 350 people across 3 ZIP codes in Maryland.
Where does St. Leonard get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). St. Leonard Water Quality Report, MD. https://zipcheckup.com/water-system/md0040013/
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title = {{St. Leonard Water Quality Report, MD}},
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