Public water system · MD0180022
ActivePatuxent Naval Air Station (Navfac-Wash)
At a glance
Patuxent Naval Air Station (Navfac-Wash) (PWSID MD0180022) is an active community water system in St. Mary's County, Maryland. It reports serving 22,000 people through 832 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in June 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
22,000
Service connections
832
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Patuxent Naval Air Station (Navfac-Wash) compare with other water systems in St. Mary's County?
By EPA's size categories, Patuxent Naval Air Station (Navfac-Wash) is a large system (10,001 to 100,000 people). St. Mary's County has 194 active public water systems, and Patuxent Naval Air Station (Navfac-Wash) is the 2nd-largest of them by population served. Its population served is about 34 times the county average of 642 people per system, and accounts for 18% of the 124,635 people reported by systems filed under the county. Across Maryland, the 2,992 active systems average 1,947 people each. Nationally, the average active community water system reports serving 6,703 people, so Patuxent Naval Air Station (Navfac-Wash) is about 3.3 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Maryland has 422 active community water systems, 14% 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 Patuxent Naval Air Station (Navfac-Wash)?
EPA lists Patuxent Naval Air Station (Navfac-Wash) 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 194 active systems in St. Mary's County (1%) are also owned by the federal government.
Does Patuxent Naval Air Station (Navfac-Wash) have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in June 2023. The violations listed here began between January 2020 and June 2023. By type: 12 monitoring and reporting. The contaminants or rules involved are Total trihalomethanes (TTHM), Lead and Copper Rule, Nitrate and Cadmium. EPA lists 8 as archived and 4 as resolved. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2023-06-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2022-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Antimonycode 1074 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nickelcode 1036 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Thalliumcode 1085 | No | Archived |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Berylliumcode 1075 | No | Archived |
The 12 most recent 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.
Patuxent Naval Air Station (Navfac-Wash): frequently asked questions
Who runs Patuxent Naval Air Station (Navfac-Wash)?
Patuxent Naval Air Station (Navfac-Wash) (PWSID MD0180022) is a community water system owned by the federal government. It is regulated by the MD state drinking water program.
How many people does Patuxent Naval Air Station (Navfac-Wash) serve?
Patuxent Naval Air Station (Navfac-Wash) reports serving 22,000 people through 832 service connections in St. Mary's County, Maryland.
Where does Patuxent Naval Air Station (Navfac-Wash) 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 Patuxent Naval Air Station (Navfac-Wash) have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in June 2023. 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 Patuxent Naval Air Station (Navfac-Wash)'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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in June 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the MD state drinking water program.
Where can I find Patuxent Naval Air Station (Navfac-Wash)'s water quality report?
As a community water system, Patuxent Naval Air Station (Navfac-Wash) must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in St. Mary's County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Lexington Park | St. Mary's | 43,030 | Community | Groundwater |
| Town of Leonardtown | St. Mary's | 5,000 | Community | Groundwater |
| Country Lakes | St. Mary's | 3,016 | Community | Groundwater |
| Cedar Cove | St. Mary's | 2,728 | Community | Groundwater |
| Saint Marys College | St. Mary's | 2,200 | Community | Groundwater |
| Chopticon High School | St. Mary's | 1,845 | 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, “Patuxent Naval Air Station (Navfac-Wash), PWSID MD0180022, Maryland”, https://aquacensus.com/water-systems/maryland/patuxent-naval-air-station-navfac-wash-md0180022 (data as of October 1, 2026).