Non-Compliance
Clean Air Act
Clean Water Act
MATTAWOMAN WASTEWATER TREATMENT PLANT
Quick Summary
- •Currently out of compliance in at least one environmental program (CAA, CWA, or RCRA).
- •Assessed $17,600 in total penalties since records began.
- Address
-
5310 HAWTHORNE RD
LA PLATA, MD 20646
View on map ↗ - County
- CHARLES County
- Industry
- Utilities
- NAICS (North American Industry Classification)
- 221320
- Inspections
- 7 · last Sep 30, 2025
- Total Penalties
- $17,600 · last Nov 18, 2023
- Registry ID
- 110000572817
Compliance Status (Last 12 Quarters)
Number of calendar quarters, out of the last 12, in which this facility was in violation of its permit. Zero means no recorded violations in that program over the past three years.
0
Air (CAA)
Qtrs Non-Compliant
Qtrs Non-Compliant
12
Water (CWA)
Qtrs Non-Compliant
Qtrs Non-Compliant
Compliance Violations
Individual permit violations recorded by the EPA across air, water, and hazardous waste programs. Open violations are unresolved as of the most recent ECHO data update.
| Program | Type | Violation Date | Return to Compliance | Status |
|---|---|---|---|---|
| cwa | Schedule Event unachieved and not reported | Mar 31, 2021 | May 1, 2021 | Resolved |
| cwa | Schedule Event unachieved and not reported | Mar 31, 2020 | May 1, 2020 | Resolved |
| cwa | Schedule Event unachieved and not reported | Mar 31, 2020 | May 1, 2020 | Resolved |
| cwa | Schedule Event unachieved and not reported | Mar 31, 2019 | May 1, 2019 | Resolved |
| cwa | Schedule Event unachieved and not reported | Mar 31, 2019 | May 1, 2019 | Resolved |
| cwa | Schedule Event unachieved and not reported | Mar 31, 2018 | May 1, 2018 | Resolved |
| cwa | Schedule Event unachieved and not reported | Mar 31, 2018 | May 1, 2018 | Resolved |
| cwa | Effluent Violations - Unauthorized Discharge | Mar 29, 2010 | — | Open |
| cwa | Effluent Violations - Unauthorized Discharge | Nov 16, 2009 | — | Open |
| cwa | Effluent Violations - Unauthorized Discharge | Oct 13, 2009 | — | Open |
| cwa | WW SSO - Discharge to Waters | May 12, 2008 | — | Open |
Discharge Limit Exceedances
Instances where this facility's reported discharge monitoring results exceeded its permitted limits under the Clean Water Act. Exceedance percentage shows how far over the permit limit the discharge was.
| Pollutant | Violation | Reported | Limit | Exceedance | Period | Status |
|---|---|---|---|---|---|---|
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.18 mg/L | 0.18 | +1% | Sep 2025 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.29 mg/L | 0.27 | +8% | Sep 2025 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 3,165.29 kg/d | 2,542.40 | +25% | Apr 2025 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.54 mg/L | 0.27 | +100% | Apr 2025 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 45.90 mg/L | 34.00 | +35% | Apr 2025 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 38.77 kg/d | 20.43 | +90% | Apr 2025 | Open |
| E. coli | DMR, Limited - Numeric Violation | 139.20 MPN/100mL | 126.00 | +10% | Mar 2025 | Open |
| E. coli | DMR, Limited - Numeric Violation | 133.00 MPN/100mL | 126.00 | +6% | Feb 2025 | Open |
| E. coli | DMR, Limited - Numeric Violation | 167.11 MPN/100mL | 126.00 | +99,999% | Aug 2024 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.29 mg/L | 0.27 | +7% | Apr 2024 | Open |
| E. coli | DMR, Limited - Numeric Violation | 1,818.90 MPN/100mL | 126.00 | +99,999% | Apr 2024 | Open |
| E. coli | DMR, Limited - Numeric Violation | 166.86 MPN/100mL | 126.00 | +99,999% | Mar 2024 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 24.95 kg/d | 20.43 | +22% | Mar 2024 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.41 mg/L | 0.27 | +50% | Mar 2024 | Open |
| E. coli | DMR, Limited - Numeric Violation | 198.77 MPN/100mL | 126.00 | +58% | Feb 2024 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.19 mg/L | 0.18 | +7% | Jan 2024 | Open |
| E. coli | DMR, Limited - Numeric Violation | 169.80 MPN/100mL | 126.00 | +99,999% | Jan 2024 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.61 mg/L | 0.27 | +126% | Jan 2024 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 25.86 kg/d | 20.43 | +27% | Jan 2024 | Open |
| E. coli | DMR, Limited - Numeric Violation | 242.46 MPN/100mL | 126.00 | +99,999% | Dec 2023 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.28 mg/L | 0.18 | +56% | Dec 2023 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.43 mg/L | 0.27 | +59% | Dec 2023 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 22.41 kg/d | 13.62 | +65% | Dec 2023 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 39.45 kg/d | 20.43 | +93% | Dec 2023 | Open |
| E. coli | DMR, Limited - Numeric Violation | 126.63 MPN/100mL | 126.00 | +1% | Oct 2023 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.48 mg/L | 0.27 | +78% | Oct 2022 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.34 mg/L | 0.18 | +89% | Oct 2022 | Open |
| E. coli | DMR, Limited - Numeric Violation | 346.35 MPN/100mL | 126.00 | +175% | Jun 2022 | Open |
| E. coli | DMR, Limited - Numeric Violation | 197.53 MPN/100mL | 126.00 | +99,999% | May 2022 | Open |
| E. coli | DMR, Limited - Numeric Violation | 541.52 MPN/100mL | 126.00 | +330% | Feb 2022 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 17.41 kg/d | 13.62 | +28% | Nov 2020 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 11,031.06 kg/d | 2,542.40 | +334% | Nov 2020 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.19 mg/L | 0.18 | +5% | Nov 2020 | Open |
| BOD, 5-day, 20 deg. C | DMR, Limited - Numeric Violation | 5,616.29 kg/d | 2,542.40 | +121% | Nov 2020 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.37 mg/L | 0.27 | +39% | Nov 2020 | Open |
| Oxygen, dissolved [DO] | DMR, Limited - Numeric Violation | 1.10 mg/L | 5.00 | +78% | Nov 2020 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 2,780.52 kg/d | 1,725.20 | +61% | Nov 2020 | Open |
| Solids, total suspended | DMR, Limited - Numeric Violation | 86.29 mg/L | 34.00 | +154% | Nov 2020 | Open |
| BOD, 5-day, 20 deg. C | DMR, Limited - Numeric Violation | 45.16 mg/L | 34.00 | +33% | Nov 2020 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 43.95 kg/d | 20.43 | +115% | Nov 2020 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.29 mg/L | 0.27 | +9% | Aug 2020 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.70 mg/L | 0.27 | +160% | Jan 2020 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 26.47 kg/d | 20.43 | +30% | Jan 2020 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 0.20 mg/L | 0.18 | +9% | Jan 2020 | Open |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 14.50 kg/d | 13.60 | +7% | Dec 2019 | Open |
| Nitrogen, total [as N] | DMR, Limited - Numeric Violation | 482.36 kg/d | 302.12 | +60% | Dec 2019 | Resolved |
| Nitrogen, total [as N] | DMR, Limited - Numeric Violation | 476.35 kg/d | 302.12 | +58% | Nov 2019 | Resolved |
| Phosphorus, total [as P] | DMR, Limited - Numeric Violation | 14.36 kg/d | 13.60 | +6% | Nov 2019 | Open |
| Nitrogen, total [as N] | DMR, Limited - Numeric Violation | 468.21 kg/d | 302.12 | +55% | Oct 2019 | Resolved |
| E. coli | DMR, Limited - Numeric Violation | 135.50 MPN/100mL | 126.00 | +8% | Oct 2019 | Open |
Enforcement Actions
Formal enforcement cases brought by the EPA or state agencies, including administrative orders and civil penalties assessed. Penalty amounts reflect what was formally assessed, not necessarily what was collected.
State Administrative Order of Consent
Clean Water Act
· Case MD-SP-25-4043 · Jun 27, 2025
State Administrative Order of Consent
Clean Water Act
· Case MD-SP-23-2888 · Nov 18, 2023
$7,000
State CWA Penalty AO
Clean Water Act
· Case MD-COP-22-2791 · May 2, 2022
$10,600
State CWA Penalty AO
Clean Water Act
· Case MD-COP-15-2791 · May 2, 2022
State CWA Penalty AO
Clean Water Act
· Case MD-PS-12-1626 · Mar 22, 2012
$8,800
State CWA Penalty AO
Clean Water Act
· Case MD-PS-08-0559 · Sep 17, 2007
$7,620
CWA 309A AO For Compliance
Clean Water Act
· Case 03-1991-N003 · Oct 11, 1990
Civil Judicial Action
Clean Water Act
· Case MD-N00000384 · Jul 30, 1990
Civil Judicial Action
Clean Water Act
· Case MD-N00000288 · Jul 3, 1990
CWA 309G2B AO For Class II Penalties
Clean Water Act
· Case 03-1989-N005 · Mar 30, 1990
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