Public water system record
Quantico Marine Base-Mainside
Serves Quantico Base, Prince William County, VA · 19,000 people served
Federal records show 14 health-based violations and 13 monitoring/reporting issues for Quantico Marine Base-Mainside in the last ten years. The most serious issue in this window was a Total Trihalomethanes (TTHMs) violation that EPA lists as archived, not resolved.
System profile
- Health-based violations, last 10 years
- 14
- Resolved
- 11
- Unresolved
- 0
- Archived by EPA
- 3
- Any acute record
- No
- Monitoring issues, last 10 years
- 13
Key facts
- Quantico Marine Base-Mainside draws water from 2 surface water intakes (1 of them for emergency, seasonal or other part-time use).
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.11 mg/L, federal limit 0.08 mg/L (1.4 times the limit), 2017.
- Most recent formal enforcement: compliance order (no penalty) by Virginia, May 2019.
- Record on file since 1984, with 12 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 95 unknown out of 1,315 service lines.
Check whether Quantico Marine Base-Mainside serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Jul 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 88 µg/L, federal limit 80 µg/L (1.1 times the limit)
|
220 | Apr 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
220 | Apr 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.083 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
220 | Jan 1, 2019 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.083 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
220 | Oct 1, 2018 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
220 | Oct 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jul 1, 2018 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.067 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Jul 1, 2018 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.064 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Apr 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.1 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
|
220 | Jan 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.11 mg/L, federal limit 0.08 mg/L (1.4 times the limit)
|
220 | Oct 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.098 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Jul 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Apr 1, 2017 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
CARBON, TOTAL
Monitoring and reporting
|
Oct 1, 2019 | Resolved |
|
Selenium
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Thallium, Total
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Beryllium, Total
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Antimony, Total
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Nickel
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Mercury
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Chromium (total)
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Cadmium
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Barium
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Arsenic
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2018 | Resolved |
|
CARBON, TOTAL
Monitoring and reporting
|
Oct 1, 2017 | Resolved |
Full record since 1984
EPA's records for Quantico Marine Base-Mainside go back to 1984. Before October 19, 2016 they list 12 health-based violations (12 resolved) and 20 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 8 |
| 1990s | 5 | 0 |
| 2000s | 3 | 0 |
| 2010 to October 18, 2016 | 4 | 12 |
| October 19, 2016 to 2019 | 11 | 13 |
| 2020s | 3 | 0 |
Most recent health-based violation before October 19, 2016: Haloacetic Acids (HAA5), began October 2015, Resolved.
Show all 12 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.067 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
Oct 1, 2015 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
|
Jul 1, 2015 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.065 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
Apr 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2004 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule (acute)
Treatment technique failure
|
Feb 1, 2004 | Resolved |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
|
Oct 1, 2003 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Jun 1, 1999 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
May 1, 1999 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 1998 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 1996 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Mar 1, 1996 | Resolved |
Enforcement actions
Virginia regulators took 1 formal enforcement action against Quantico Marine Base-Mainside and issued 1 boil water order between 2004 and 2019. The most recent was a compliance order (no penalty) in May 2019.
| Date | By | Action | Violations covered |
|---|---|---|---|
| May 15, 2019 | Virginia | Compliance order (no penalty) | 11 violations (11 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Feb 17, 2004 | Virginia | Boil water order | 1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule |
What the violations mean
Total Trihalomethanes (TTHMs)
11 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
Haloacetic Acids (HAA5)
3 incidentsHaloacetic acid byproducts exceeded the federal limit
Long-term exposure to HAAs may increase cancer risk
Where the water comes from
Quantico Marine Base-Mainside draws water from 2 surface water intakes (1 of them for emergency, seasonal or other part-time use). 1 other community water system buys water from Quantico Marine Base-Mainside.
Community systems that buy water from it
- Town of Quantico Quantico, VA
Annual water quality report
Quantico Marine Base-Mainside must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Virginia.
Certified drinking water labs by state EPA guidance for private wells