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Community Water System · PWS MD1040022

The Calverton School

Huntingtown, Maryland 20639 - drinking water served from groundwater sources to 461 people, tracked in EPA SDWIS and UCMR5.

461
People served
50
EPA violations
9
Health-based
Untested
UCMR5 result

The verdict

EPA records 50 drinking-water violations at The Calverton School, 18% of them health-based - above the Maryland per-system average.

50
Total EPA violations on record
18%
Health-based (MCL / treatment failure)
461
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: The Calverton School

The Calverton School is a private-owned community water system that delivers drinking water to 461 residents in Huntingtown, Maryland (Calvert County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 50 total violations for this system , of which 9 (18%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 37 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 8 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Maryland, EPA tracks 3,215 public water systems serving 6,070,211 people, with 60,496 cumulative violations and 18,132 health-based violations on record. About 80% of systems in the state carry at least one violation, and state-wide the average per system is 18.8 violations. Statewide, 50 of 83 UCMR5-tested systems have reported PFAS detections (60.2%).

The Calverton School's 50 violations sit above the Maryland average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
461
Total Violations
50
Health-Based Violations
9
Water Source
Groundwater

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

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for The Calverton School.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID MD1040022 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Maryland Drinking Water Authority

Maryland's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find MD regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 Consumer Confidence Rule Other 1 SDWIS / MD1040022 / 7000
2024 Nitrate MR 2 SDWIS / MD1040022 / 1040
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / MD1040022 / 5200
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / MD1040022 / 5200
2011 Coliform (TCR) MR 7 SDWIS / MD1040022 / 3100
2010 Arsenic MR 7 SDWIS / MD1040022 / 1005
2007 Coliform (TCR) MCL 8 SDWIS / MD1040022 / 3100
2000 Thallium, Total MR 2 SDWIS / MD1040022 / 1085
2000 Selenium MR 2 SDWIS / MD1040022 / 1045
2000 Barium MR 2 SDWIS / MD1040022 / 1010
2000 Cadmium MR 2 SDWIS / MD1040022 / 1015
2000 Chromium MR 2 SDWIS / MD1040022 / 1020
2000 Mercury MR 2 SDWIS / MD1040022 / 1035
2000 Nickel MR 2 SDWIS / MD1040022 / 1036
2000 Antimony, Total MR 2 SDWIS / MD1040022 / 1074

How The Calverton School Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric The Calverton School Maryland avg Federal benchmark
Total violations 50 18.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 9 5.6 Indicates a contaminant exceeded a federal MCL
PFAS detection None 60.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 461 1,888 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 3,215 regulated public water systems in Maryland.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is The Calverton School water safe to drink? ▼
The Calverton School (PWS ID: MD1040022) has 50 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 461 people using Groundwater sources.
How many people does The Calverton School serve? ▼
The Calverton School serves 461 people in Huntingtown, Maryland. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does The Calverton School have? ▼
The Calverton School has 50 total violations: 9 health-based violations (MCL exceedances or treatment failures), 37 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in The Calverton School water? ▼
No PFAS testing data is available for The Calverton School under the EPA's UCMR5 monitoring program.
What water source does The Calverton School use? ▼
The Calverton School uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.