ARCATA WWTF
NPDES ID: CA0022713
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
Violations
October 31, 2025
Solids, total suspended
22% over limit
Discharged 39 mg/L against a permitted limit of 32 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, total suspended
27% over limit
Discharged 61 mg/L against a permitted limit of 48 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, settleable
900% over limit
Discharged 0.002 mg/L against a permitted limit of 0.0002 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Cyanide, total [as CN]
202% over limit
Discharged 0.0013 mg/L against a permitted limit of 0.00043 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
40% over limit
Discharged 0.0014 mg/L against a permitted limit of 0.001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Cyanide, total [as CN]
133% over limit
Discharged 0.001 mg/L against a permitted limit of 0.00043 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Cyanide, total [as CN]
20% over limit
Discharged 0.0012 mg/L against a permitted limit of 0.001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total recoverable
18% over limit
Discharged 0.0039 mg/L against a permitted limit of 0.0033 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Cyanide, total [as CN]
179% over limit
Discharged 0.0012 mg/L against a permitted limit of 0.00043 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
20% over limit
Discharged 0.0012 mg/L against a permitted limit of 0.001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
BOD, 5-day, 20 deg. C
180% over limit
Discharged 84 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
589% over limit
Discharged 310 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
300% over limit
Discharged 40 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
673% over limit
Discharged 7730000 mg/L against a permitted limit of 1000000 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
673% over limit
Discharged 7730000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Cyanide, total [as CN]
50% over limit
Discharged 0.0015 mg/L against a permitted limit of 0.001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
96Hr Acute Ceriodaphn. Dubia % Srv
0% over limit
Discharged 0 % against a permitted limit of 70 % (MINIMUM)
DMR, Limited - Overdue
Solids, total suspended
33% over limit
Discharged 64 mg/L against a permitted limit of 48 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
%Surv Static 96Hr Acute Pimphales Promelas
100% over limit
Discharged 0 % against a permitted limit of 70 % (MINIMUM)
DMR, Limited - Numeric Violation
96Hr Acute Ceriodaphn. Dubia % Srv
0% over limit
Discharged 0 % against a permitted limit of 90 % (MEDN MN)
DMR, Limited - Overdue
Solids, total suspended
31% over limit
Discharged 42 mg/L against a permitted limit of 32 mg/L (MO AVG)
DMR, Limited - Numeric Violation
%Surv Static 96Hr Acute Pimphales Promelas
100% over limit
Discharged 0 % against a permitted limit of 90 % (MEDN MN)
DMR, Limited - Numeric Violation
96Hr Acute Ceriodaphn. Dubia % Srv
100% over limit
Discharged 0 % against a permitted limit of 90 % (MEDN MN)
DMR, Limited - Numeric Violation
96Hr Acute Ceriodaphn. Dubia % Srv
100% over limit
Discharged 0 % against a permitted limit of 70 % (MINIMUM)
DMR, Limited - Numeric Violation
November 30, 2024
Solids, total suspended
29% over limit
Discharged 62 mg/L against a permitted limit of 48 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
133% over limit
Discharged 0.001 mg/L against a permitted limit of 0.00043 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
53% over limit
Discharged 49 mg/L against a permitted limit of 32 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Cyanide, total [as CN]
20% over limit
Discharged 0.0012 mg/L against a permitted limit of 0.001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Cyanide, total [as CN]
226% over limit
Discharged 0.0014 mg/L against a permitted limit of 0.00043 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
40% over limit
Discharged 0.0014 mg/L against a permitted limit of 0.001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2024
Cyanide, total [as CN]
30% over limit
Discharged 0.0013 mg/L against a permitted limit of 0.001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)