Non-Transient Non-Community Water System · PWS MD1041131
Jefferson Patterson Park and Museum
Operator location St. Leonard, Maryland - smaller served population (≤ 999) at 35 people served; 123 SDWIS violations on record from groundwater sources.
- 35
- People served (this PWS)
- 123
- EPA violations (this PWS)
- 17
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Jefferson Patterson Park and Museum standing, high SDWIS violation third
35 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 14% is middle-third health share (≤ 23%).
The verdict
Jefferson Patterson Park and Museum sits in the upper third of the sitemap cohort by violation count (123), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (35; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 14% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 123
- Total EPA violations on record
- 14%
- Health-based (MCL / treatment failure)
- 35
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 1
- County
- Calvert
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 105
- Treatment Tech Violations
- 8
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 20 | 2012 |
| Lead and Copper Rule | MR | 11 | 2008 |
| Coliform (TCR) | MCL | 9 | 2008 |
| Nitrate | MR | 8 | 2009 |
| Chromium | MR | 7 | 2020 |
| Mercury | MR | 7 | 2020 |
| Antimony, Total | MR | 7 | 2020 |
| Beryllium, Total | MR | 7 | 2020 |
| Thallium, Total | MR | 7 | 2020 |
| Lead and Copper Rule | TT | 7 | 2008 |
| Barium | MR | 7 | 2020 |
| Selenium | MR | 7 | 2020 |
| Cadmium | MR | 7 | 2020 |
| Nickel | MR | 7 | 2020 |
| Arsenic | MR | 3 | 2008 |
| LEAD AND COPPER RULE REVISIONS | TT | 1 | 2024 |
| LEAD AND COPPER RULE REVISIONS | RPT | 1 | 2024 |
Violation Count vs. the National Corpus
Jefferson Patterson Park and Museum has 123 recorded EPA violations, 77% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 23% carry more. 14% of this system's own violations are health-based (17 of 123), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
123 Higher than most more violations than 77% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Population served record for Jefferson Patterson Park and Museum
EPA SDWIS lists 35 people served and 1 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
123 violations · 35 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Jefferson Patterson Park and Museum
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Maryland compares on the same EPA violation measures. Maryland systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.