St. Leonard
EPA ID: MD0040013 · 350 people served · 3 ZIP codes
ZipCheckup's reading of EPA records for St. Leonard (MD0040013): no drinking-water violations recorded since 2021. Violation-free in EPA records - St. Leonard, 350 residents served.
Data: EPA SDWIS
Service Area Map
Coverage area for St. Leonard Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with St. Leonard have a median household income of $122,059 and about 30,412 residents live in those ZIP codes (Census; not the number of people this system supplies). 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 classified in EPA records as a groundwater source. 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
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 |
|---|---|---|
| Below the reporting limit | No | 2023-12-31 |
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: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
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 available EPA compliance records 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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