Public water system · MD0040019
ActiveNaval Research Lab., Chesapeake Bay Div.
At a glance
Naval Research Lab., Chesapeake Bay Div. (PWSID MD0040019) is an active non-transient non-community water system in Calvert County, Maryland. It reports serving 60 people through 71 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list 9 violations for this system; none is health-based, and the most recent began in January 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
60
Service connections
71
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Naval Research Lab., Chesapeake Bay Div. compare with other water systems in Calvert County?
By EPA's size categories, Naval Research Lab., Chesapeake Bay Div. is a very small system (500 people or fewer). Calvert County has 203 active public water systems. Its population served is well below the county average of 384 people per system, and accounts for less than 0.1% of the 77,996 people reported by systems filed under the county. Across Maryland, the 2,992 active systems average 1,947 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Naval Research Lab., Chesapeake Bay Div. is well below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Maryland has 491 active non-transient non-community water systems, 16% of the state's 2,992 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,870 Maryland systems (96%) list groundwater as their primary source.
Who owns and regulates Naval Research Lab., Chesapeake Bay Div.?
EPA lists Naval Research Lab., Chesapeake Bay Div. as owned by the federal government. The MD state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 2 of the 203 active systems in Calvert County (1%) are also owned by the federal government.
Does Naval Research Lab., Chesapeake Bay Div. have drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in January 2025. The violations listed here began between January 2006 and January 2025. By type: 8 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Nitrate (2 of them). EPA lists 5 as resolved and 4 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 2023-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 2016-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2010-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2007-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2007-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2006-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
All 9 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Naval Research Lab., Chesapeake Bay Div.: frequently asked questions
Who runs Naval Research Lab., Chesapeake Bay Div.?
Naval Research Lab., Chesapeake Bay Div. (PWSID MD0040019) is a non-transient non-community water system owned by the federal government. It is regulated by the MD state drinking water program.
How many people does Naval Research Lab., Chesapeake Bay Div. serve?
Naval Research Lab., Chesapeake Bay Div. reports serving 60 people through 71 service connections in Calvert County, Maryland.
Where does Naval Research Lab., Chesapeake Bay Div. get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Naval Research Lab., Chesapeake Bay Div. have any drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in January 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Naval Research Lab., Chesapeake Bay Div.'s water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 9 violations for this system; none is health-based, and the most recent began in January 2025. For current results, consult EPA ECHO, or the MD state drinking water program.
Where can I find Naval Research Lab., Chesapeake Bay Div.'s water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Naval Research Lab., Chesapeake Bay Div. is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Calvert County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Chesapeake Ranch Estates | Calvert | 9,500 | Community | Groundwater |
| Town of Chesapeake Beach | Calvert | 5,000 | Community | Groundwater |
| Prince Frederick | Calvert | 4,371 | Community | Groundwater |
| Solomons | Calvert | 3,811 | Community | Groundwater |
| Town of North Beach | Calvert | 3,000 | Community | Groundwater |
| Northern Middle & High Schools | Calvert | 2,470 | Non-transient non-community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Naval Research Lab., Chesapeake Bay Div., PWSID MD0040019, Maryland”, https://aquacensus.com/water-systems/maryland/naval-research-lab-chesapeake-bay-div-md0040019 (data as of October 1, 2026).