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Community Water System · PWS MD0040004

Chesapeake Ranch Estates

Lusby, Maryland 20657 - drinking water served from groundwater sources to 9,500 people, tracked in EPA SDWIS and UCMR5.

9,500
People served
11
EPA violations
4
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 11 drinking-water violations at Chesapeake Ranch Estates, 36% of them health-based - below the Maryland per-system average.

11
Total EPA violations on record
36%
Health-based (MCL / treatment failure)
9,500
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Chesapeake Ranch Estates

Chesapeake Ranch Estates is a private-owned community water system that delivers drinking water to 9,500 residents in Lusby, Maryland (Calvert County) through 3,874 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 11 total violations for this system , of which 4 (36%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. The most recent violation on record dates to 2013.

The most frequently cited contaminant at this system is Arsenic, recorded in 4 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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%).

Chesapeake Ranch Estates's 11 violations sit below 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
9,500
Total Violations
11
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
3,874
County
Calvert
School/Daycare
No
MCL Violations
4
Monitoring Violations
0
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Arsenic MCL 4 2013
Consumer Confidence Rule Other 2 2003

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 232 samples detected PFAS.

Contaminant Date Result MRL Status
PFOS 6/5/2023 <4.00 ppt 4.00 ppt Not Detected
4:2 FTS 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 6/5/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 6/5/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 6/5/2023 <6.00 ppt 6.00 ppt Not Detected
PFBS 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
PFNA 6/5/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeS 6/5/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 6/5/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 6/5/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 6/5/2023 <20.00 ppt 20.00 ppt Not Detected
PFHpS 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 6/5/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 6/5/2023 <2.00 ppt 2.00 ppt Not Detected
4:2 FTS 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 6/5/2023 <4.00 ppt 4.00 ppt Not Detected
6:2 FTS 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
PFPeA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 6/5/2023 <20.00 ppt 20.00 ppt Not Detected
PFDoA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 6/5/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 6/5/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 6/5/2023 <7.00 ppt 7.00 ppt Not Detected
NMeFOSAA 6/5/2023 <6.00 ppt 6.00 ppt Not Detected
PFEESA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 6/5/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 6/5/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 6/5/2023 <3.00 ppt 3.00 ppt Not Detected

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 Chesapeake Ranch Estates.

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 MD0040004 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
2013 Arsenic MCL 4 SDWIS / MD0040004 / 1005
2003 Consumer Confidence Rule Other 2 SDWIS / MD0040004 / 7000

How Chesapeake Ranch Estates Compares

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

Metric Chesapeake Ranch Estates Maryland avg Federal benchmark
Total violations 11 18.8 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 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 9,500 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 Chesapeake Ranch Estates water safe to drink? ▼
Chesapeake Ranch Estates (PWS ID: MD0040004) has 11 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 9,500 people using Groundwater sources.
How many people does Chesapeake Ranch Estates serve? ▼
Chesapeake Ranch Estates serves 9,500 people in Lusby, Maryland. It is a Private-owned system using Groundwater water sources with 3,874 service connections.
What type of violations does Chesapeake Ranch Estates have? ▼
Chesapeake Ranch Estates has 11 total violations: 4 health-based violations (MCL exceedances or treatment failures), 0 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Chesapeake Ranch Estates water? ▼
No. Chesapeake Ranch Estates was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Chesapeake Ranch Estates use? ▼
Chesapeake Ranch Estates 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). 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.