- System name
- Patuxent Naval Air Station (Navfac-Wash)
- EPA PWS ID
- MD0180022
- Location
- Patuxent River, MD
- Population served
- 22,000
- Water source
- Ground water
- Primary EPA source
- EPA ECHO record for MD0180022
Make sure this is the system tied to your address before using these results to make a decision about your own water. A ZIP code is not a street address.
EPA lab monitoring (UCMR 5)
EPA UCMR 5 monitoring (Mar. 2025–Sept. 2025) detected 1 of the 30 monitored chemicals in this system's samples. Highest reported lithium result: 19.7 ppb.
| Chemical | Highest result | EPA legal limit (MCL) | EPA health goal (MCLG) |
|---|---|---|---|
| lithium a metal | 19.7 ppb | No federal MCL | — |
UCMR 5 results are monitoring data, not a compliance determination. PFAS compliance is governed by separate EPA drinking-water rules. Some PFAS rule changes are proposed for 2026 — see what's proposed.
Lead at customer taps
Lead at sampled customer taps, 90th percentile (Jan. 2023–Dec. 2025): 0 ppb. EPA's current action level is 15 ppb; its health goal (MCLG) is 0.
Lead is regulated with an action level rather than a standard MCL. EPA's lead action level is 15 ppb today; the Lead and Copper Rule Improvements lower it to 10 ppb starting Nov. 1, 2027.
Violations on the federal record
The EPA record shows 13 violations, 0 health-based.
| Type | Rule / contaminant | Since |
|---|---|---|
| Record · missed required testing or reporting | — | 2020 |
| Record · missed required testing or reporting | — | 2020 |
| Record · missed required testing or reporting | — | 2020 |
| Record · missed required testing or reporting | Lead | 2020 |
| Record · missed required testing or reporting | — | 2020 |
| Record · missed required testing or reporting | Antimony | 2020 |
| Record · missed required testing or reporting | Barium | 2020 |
| Record · missed required testing or reporting | Chromium | 2020 |
| Record · missed required testing or reporting | — | 2020 |
| Record · missed required testing or reporting | Nitrate | 2022 |
| Record · missed required testing or reporting | — | 2020 |
| Record · missed required testing or reporting | Lead & Copper Rule | 2022 |
On a private well? EPA public-system data does not describe your individual well. Test your water directly.
What the numbers mean
EPA uses two different benchmarks: the legal limit (MCL) and the health goal (MCLG). They are not always the same number. Read EPA's explanation →
Open the interactive report →What the government says
Sources: U.S. EPA SDWIS (system record and violations, queried live) · EPA UCMR 5 final dataset · EPA SDWIS lead & copper 90th-percentile results. EPA data can lag the latest tests.