PORT COSTA WWTP

Address

CANYON LAKE DRIVE
PORT COSTA, CA 94569
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County

CONTRA COSTA County

Inspections

1 · last Jun 16, 2023

Total Penalties

$0

Registry ID

110010059293

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.

3

Water (CWA)
Qtrs Non-Compliant

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
Dieldrin	DMR, Limited - Numeric Violation	0.00 mg/L	0.00	+1,114%	Dec 2025	Open
4,4'-DDE	DMR, Limited - Numeric Violation	0.00 mg/L	0.00	+53%	Dec 2025	Open
4,4'-DDD	DMR, Limited - Numeric Violation	0.00 mg/L	0.00	+24%	Dec 2025	Open
4,4'-DDD	DMR, Limited - Numeric Violation	0.00 mg/L	0.00	+150%	Dec 2025	Open
Dieldrin	DMR, Limited - Numeric Violation	0.00 mg/L	0.00	+507%	Dec 2025	Open
BOD, 5-day, 20 deg. C	DMR, Limited - Numeric Violation	145.00 mg/L	45.00	+222%	Oct 2025	Open
BOD, 5-day, 20 deg. C	DMR, Limited - Numeric Violation	411.00 mg/L	45.00	+813%	Sep 2025	Open
BOD, 5-day, 20 deg. C	DMR, Limited - Numeric Violation	411.00 mg/L	30.00	+1,270%	Sep 2025	Open
Enterococci	DMR, Limited - Numeric Violation	9,208.00 MPN/100mL	1,000.00	+821%	Jul 2025	Open
Solids, total suspended	DMR, Limited - Numeric Violation	58.80 mg/L	45.00	+31%	Dec 2023	Open
Enterococci	DMR, Limited - Numeric Violation	1.10 MPN/100mL	35.00	+99,999%	Nov 2023	Open
Enterococci	DMR, Limited - Numeric Violation	40.60 MPN/100mL	35.00	+16%	Feb 2023	Open
Solids, total suspended	DMR, Limited - Numeric Violation	4.10 mg/L	45.00	+99,999%	Mar 2021	Open
BOD, 5-day, percent removal	DMR, Limited - Numeric Violation	8.90 %	85.00	+507%	Apr 2019	Open
BOD, 5-day, 20 deg. C	DMR, Limited - Numeric Violation	34.00 mg/L	30.00	+13%	Jan 2019	Open
BOD, 5-day, 20 deg. C	DMR, Limited - Numeric Violation	150.00 mg/L	45.00	+233%	Jan 2019	Resolved
Solids, suspended percent removal	DMR, Limited - Numeric Violation	98.90 %	85.00	+99,999%	May 2018	Open
Nitrogen, ammonia total [as N]	DMR, Limited - Numeric Violation	16.20 mg/L	13.00	+25%	Mar 2018	Open
Chlorine, total residual	DMR, Limited - Numeric Violation	0.02 mg/L	0.00	+2,147,483,650%	Jan 2018	Open
%Surv Static 96Hr Acute Pimphales Promelas	DMR, Limited - Numeric Violation	30.00 %	90.00	+67%	Jun 2017	Open
%Surv Static 96Hr Acute Pimphales Promelas	DMR, Limited - Numeric Violation	0.00 %	70.00	+100%	Jun 2017	Open
Chlorine, total residual	DMR, Limited - Numeric Violation	4.40 mg/L	0.00	+2,147,483,650%	Feb 2017	Open
Enterococci	DMR, Limited - Numeric Violation	2.10 MPN/100mL	35.00	+99,999%	Nov 2016	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 CWA Penalty AO

Clean Water Act · Case CA-N00003556

State CWA Penalty AO

Clean Water Act · Case CA-CFEA433545 · Jan 23, 2020

State CWA Non Penalty AO

Clean Water Act · Case CA-N00004197 · Jan 30, 2008

State CWA Non Penalty AO

Clean Water Act · Case CA-N00003557 · Oct 19, 2005

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