Community Water System · PWS MD1040022
The Calverton School
Operator location Huntingtown, Maryland - smaller served population (≤ 999) at 461 people served; 50 SDWIS violations on record from groundwater sources.
- 461
- People served (this PWS)
- 50
- EPA violations (this PWS)
- 9
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
The Calverton School standing, mid SDWIS violation third
461 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 18% is middle-third health share (≤ 23%).
The verdict
The Calverton School lands in the middle third by violation volume (50), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (461; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 18% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 50
- Total EPA violations on record
- 18%
- Health-based (MCL / treatment failure)
- 461
- 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
- Community
- Owner Type
- Private
- Connections
- 1
- County
- Calvert
- School/Daycare
- Yes
- MCL Violations
- 8
- Monitoring Violations
- 37
- Treatment Tech Violations
- 1
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 8 | 2007 |
| Arsenic | MR | 7 | 2010 |
| Coliform (TCR) | MR | 7 | 2011 |
| Lead and Copper Rule | MR | 3 | 1998 |
| Thallium, Total | MR | 2 | 2000 |
| Selenium | MR | 2 | 2000 |
| Nitrate | MR | 2 | 2024 |
| Barium | MR | 2 | 2000 |
| Cadmium | MR | 2 | 2000 |
| Chromium | MR | 2 | 2000 |
| Mercury | MR | 2 | 2000 |
| Nickel | MR | 2 | 2000 |
| Antimony, Total | MR | 2 | 2000 |
| Beryllium, Total | MR | 2 | 2000 |
| LEAD AND COPPER RULE REVISIONS | RPT | 1 | 2024 |
| Consumer Confidence Rule | Other | 1 | 2025 |
| LEAD AND COPPER RULE REVISIONS | TT | 1 | 2024 |
Violation Count vs. the National Corpus
The Calverton School has 50 recorded EPA violations, 56% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 43% carry more. 18% of this system's own violations are health-based (9 of 50), 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)
50 Around the middle fewer violations than 43% 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 The Calverton School
EPA SDWIS lists 461 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
50 violations · 461 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with The Calverton School
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.