HECLA LIMITED — NPDES permit ID0026468: limits, due date and EPA's record

NPDES permit ID0026468 · Major NON-POTW · administratively continued, expires 2023-11-30 · EPA's file as of 2026-09-19

This permit expired on 2023-11-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

Reporting

Reports are due about 20 days after each monitoring period ends (the most common figure among ID permits in EPA's filings — check your permit).

Limits in force (188)

Outfall	Parameter	Statistic	Limit	Months
002	Temperature, water deg. centigrade	MX 7D AV	report only	all year
002	Temperature, water deg. centigrade	DAILY MX	report only	all year
002	Temperature, water deg. centigrade	INST MAX	report only	all year
002	Streamflow	DAILY MN	report only	all year
002	Streamflow	MO AVG	report only	all year
002	Conductivity	MO AVG	report only	all year
002	Conductivity	DAILY MX	report only	all year
002	pH	INST MIN	>= 6.5 SU	all year
002	pH	INST MAX	<= 9 SU	all year
002	Solids, total suspended	MO AVG	<= 20 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
002	Nitrogen, ammonia total [as N]	MO AVG	report only	Apr, Jun, Aug, Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	Apr, Jun, Aug, Oct
002	Nitrite + Nitrate total [as N]	MO AVG	report only	Apr, Jun, Aug, Oct
002	Nitrite + Nitrate total [as N]	DAILY MX	report only	Apr, Jun, Aug, Oct
002	Carbon, dissolved organic [as C]	MO AVG	report only	all year
002	Carbon, dissolved organic [as C]	DAILY MX	report only	all year
002	Cyanide, weak acid, dissociable	MO AVG	report only	Apr, Jun, Aug, Oct
002	Cyanide, weak acid, dissociable	DAILY MX	report only	Apr, Jun, Aug, Oct
002	Hardness, total [as CaCO3]	MO AVG	report only	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	all year
002	Arsenic, total recoverable	MO AVG	report only	Apr, Jun, Aug, Oct
002	Arsenic, total recoverable	DAILY MX	report only	Apr, Jun, Aug, Oct
002	Selenium, total recoverable	MO AVG	report only	Apr, Jun, Aug, Oct
002	Selenium, total recoverable	DAILY MX	report only	Apr, Jun, Aug, Oct
002	Silver total recoverable	MO AVG	report only	Apr, Jun, Aug, Oct
002	Silver total recoverable	DAILY MX	report only	Apr, Jun, Aug, Oct
002	Zinc, total recoverable	MO AVG	<= 141 ug/L	all year
002	Zinc, total recoverable	MO AVG	<= 107 ug/L	all year
002	Zinc, total recoverable	DAILY MX	<= 304 ug/L	all year
002	Zinc, total recoverable	DAILY MX	<= 230 ug/L	all year
002	Aluminum, total recoverable	MO AVG	report only	Apr, Jun, Aug, Oct
002	Aluminum, total recoverable	DAILY MX	report only	Apr, Jun, Aug, Oct
002	Cadmium, total recoverable	MO AVG	<= 1.44 ug/L	all year
002	Cadmium, total recoverable	MO AVG	<= 1.32 ug/L	all year
002	Cadmium, total recoverable	DAILY MX	<= 2.72 ug/L	all year
002	Cadmium, total recoverable	DAILY MX	<= 2.5 ug/L	all year
002	Lead, total recoverable	MO AVG	<= 1.8 ug/L	all year
002	Lead, total recoverable	MO AVG	<= .84 ug/L	all year
002	Lead, total recoverable	DAILY MX	<= 4.84 ug/L	all year
002	Lead, total recoverable	DAILY MX	<= 2.28 ug/L	all year
002	Copper, total recoverable	MO AVG	<= 18.6 ug/L	all year
002	Copper, total recoverable	MO AVG	<= 14.9 ug/L	all year
002	Copper, total recoverable	DAILY MX	<= 41.9 ug/L	all year
002	Copper, total recoverable	DAILY MX	<= 33.5 ug/L	all year
002	Floating solids, waste or visible foam-visual	MO MAX	<= 0 N=0;Y=1	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= 5.57 cfs	all year
002	Mercury, total [as Hg]	MO AVG	<= .022 ug/L	all year
002	Mercury, total [as Hg]	DAILY MX	<= .057 ug/L	all year
002	Effluent dilution ratio	DAILY MN	>= 8 Ratio	all year
002	Toxicity, Acute	MO AVG	report only	Apr
002	Toxicity, Acute	DAILY MX	report only	Apr
002	Toxicity, Chronic	MO AVG	<= 4.6 toxic	Apr, Jun, Aug, Oct
002	Toxicity, Chronic	DAILY MX	<= 9.2 toxic	Apr, Jun, Aug, Oct
003	Temperature, water deg. centigrade	MX 7D AV	report only	all year
003	Temperature, water deg. centigrade	DAILY MX	report only	all year
003	Temperature, water deg. centigrade	INST MAX	report only	all year
003	Streamflow	MO AVG	report only	all year
003	Conductivity	MO AVG	report only	all year
003	Conductivity	DAILY MX	report only	all year
003	pH	INST MIN	>= 6.5 SU	all year
003	pH	INST MAX	<= 9 SU	all year
003	Solids, total suspended	MO AVG	<= 20 mg/L	all year
003	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
003	Nitrogen, ammonia total [as N]	MO AVG	report only	Apr, Jun, Aug, Oct
003	Nitrogen, ammonia total [as N]	DAILY MX	report only	Apr, Jun, Aug, Oct
003	Nitrite + Nitrate total [as N]	MO AVG	report only	Apr, Jun, Aug, Oct
003	Nitrite + Nitrate total [as N]	DAILY MX	report only	Apr, Jun, Aug, Oct
003	Carbon, dissolved organic [as C]	MO AVG	report only	all year
003	Carbon, dissolved organic [as C]	DAILY MX	report only	all year
003	Cyanide, weak acid, dissociable	MO AVG	report only	Apr, Jun, Aug, Oct
003	Cyanide, weak acid, dissociable	DAILY MX	report only	Apr, Jun, Aug, Oct
003	Hardness, total [as CaCO3]	MO AVG	report only	all year
003	Hardness, total [as CaCO3]	DAILY MX	report only	all year
003	Selenium, total recoverable	MO AVG	report only	Apr, Jun, Aug, Oct
003	Selenium, total recoverable	DAILY MX	report only	Apr, Jun, Aug, Oct
003	Arsenic, total [as As]	MO AVG	report only	Apr, Jun, Aug, Oct
003	Arsenic, total [as As]	DAILY MX	report only	Apr, Jun, Aug, Oct
003	Silver total recoverable	MO AVG	report only	Apr, Jun, Aug, Oct
003	Silver total recoverable	DAILY MX	report only	Apr, Jun, Aug, Oct
003	Zinc, total recoverable	MO AVG	<= 158 ug/L	all year
003	Zinc, total recoverable	MO AVG	<= 147 ug/L	all year
003	Zinc, total recoverable	MO AVG	<= 167 ug/L	all year
003	Zinc, total recoverable	DAILY MX	<= 344 ug/L	all year
003	Zinc, total recoverable	DAILY MX	<= 319 ug/L	all year
003	Zinc, total recoverable	DAILY MX	<= 364 ug/L	all year
003	Aluminum, total recoverable	MO AVG	report only	Apr, Jun, Aug, Oct
003	Aluminum, total recoverable	DAILY MX	report only	Apr, Jun, Aug, Oct
003	Cadmium, total recoverable	MO AVG	<= 2.22 ug/L	all year
003	Cadmium, total recoverable	MO AVG	<= 2.5 ug/L	all year
003	Cadmium, total recoverable	MO AVG	<= 2.96 ug/L	all year
003	Cadmium, total recoverable	DAILY MX	<= 4.08 ug/L	all year
003	Cadmium, total recoverable	DAILY MX	<= 4.59 ug/L	all year
003	Cadmium, total recoverable	DAILY MX	<= 5.42 ug/L	all year
003	Lead, total recoverable	MO AVG	<= 1.4 ug/L	all year
003	Lead, total recoverable	MO AVG	<= .75 ug/L	all year
003	Lead, total recoverable	MO AVG	<= .96 ug/L	all year
003	Lead, total recoverable	DAILY MX	<= 4.84 ug/L	all year
003	Lead, total recoverable	DAILY MX	<= 2.6 ug/L	all year
003	Lead, total recoverable	DAILY MX	<= 3.32 ug/L	all year
003	Copper, total recoverable	MO AVG	<= 21.6 ug/L	all year
003	Copper, total recoverable	MO AVG	<= 21.8 ug/L	all year
003	Copper, total recoverable	MO AVG	<= 20.8 ug/L	all year
003	Copper, total recoverable	DAILY MX	<= 39.8 ug/L	all year
003	Copper, total recoverable	DAILY MX	<= 40.3 ug/L	all year
003	Copper, total recoverable	DAILY MX	<= 38.5 ug/L	all year
003	Floating solids, waste or visible foam-visual	MO MAX	<= 0 N=0;Y=1	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	<= .668 cfs	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	<= 1.11 cfs	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	<= 2.01 cfs	all year
003	Mercury, total [as Hg]	MO AVG	<= .026 ug/L	all year
003	Mercury, total [as Hg]	MO AVG	<= .025 ug/L	all year
003	Mercury, total [as Hg]	MO AVG	<= .035 ug/L	all year
003	Mercury, total [as Hg]	DAILY MX	<= .053 ug/L	all year
003	Mercury, total [as Hg]	DAILY MX	<= .05 ug/L	all year
003	Mercury, total [as Hg]	DAILY MX	<= .069 ug/L	all year
003	Toxicity, Acute	MO AVG	report only	Apr
003	Toxicity, Acute	DAILY MX	report only	Apr
003	Toxicity, Chronic	MO AVG	<= 25 toxic	Apr, Jun, Aug, Oct
003	Toxicity, Chronic	MO AVG	<= 9.1 toxic	Apr, Jun, Aug, Oct
003	Toxicity, Chronic	MO AVG	<= 10 toxic	Apr, Jun, Aug, Oct
003	Toxicity, Chronic	DAILY MX	<= 51 toxic	Apr, Jun, Aug, Oct
003	Toxicity, Chronic	DAILY MX	<= 18 toxic	Apr, Jun, Aug, Oct
003	Toxicity, Chronic	DAILY MX	<= 20 toxic	Apr, Jun, Aug, Oct
REC	Temperature, water deg. centigrade	MX 7D AV	report only	Jul, Aug, Sep
REC	Temperature, water deg. centigrade	MX 7D AV	report only	Jul, Aug, Sep
REC	Temperature, water deg. centigrade	DAILY MX	report only	Jul, Aug, Sep
REC	Temperature, water deg. centigrade	DAILY MX	report only	Jul, Aug, Sep
REC	Temperature, water deg. centigrade	INST MAX	report only	Jul, Aug, Sep
REC	Temperature, water deg. centigrade	INST MAX	report only	Jul, Aug, Sep
REC	Temperature, water deg. centigrade	INST MAX	report only	Apr, Jun, Oct
REC	Temperature, water deg. centigrade	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Turbidity	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Turbidity	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Conductivity	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Conductivity	INST MAX	report only	Apr, Jun, Aug, Oct
REC	pH	INST MAX	report only	Apr, Jun, Aug, Oct
REC	pH	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Nitrogen, ammonia total [as N]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Nitrogen, ammonia total [as N]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Nitrite + Nitrate total [as N]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Nitrite + Nitrate total [as N]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Carbon, dissolved organic [as C]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Carbon, dissolved organic [as C]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Hardness, total [as CaCO3]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Hardness, total [as CaCO3]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Selenium, total recoverable	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Selenium, total recoverable	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Copper, dissolved [as Cu]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Copper, dissolved [as Cu]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Lead, dissolved [as Pb]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Lead, dissolved [as Pb]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Zinc, dissolved [as Zn]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Zinc, dissolved [as Zn]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Mercury, total [as Hg]	INST MAX	report only	Apr, Jun, Aug, Oct
REC	Mercury, total [as Hg]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Temperature, water deg. centigrade	MX 7D AV	report only	Jul, Aug, Sep
REC2	Temperature, water deg. centigrade	MX 7D AV	report only	Jul, Aug, Sep
REC2	Temperature, water deg. centigrade	DAILY MX	report only	Jul, Aug, Sep
REC2	Temperature, water deg. centigrade	DAILY MX	report only	Jul, Aug, Sep
REC2	Temperature, water deg. centigrade	INST MAX	report only	Jul, Aug, Sep
REC2	Temperature, water deg. centigrade	INST MAX	report only	Jul, Aug, Sep
REC2	Temperature, water deg. centigrade	INST MAX	report only	Apr, Jun, Oct
REC2	Temperature, water deg. centigrade	INST MAX	report only	Apr, Jun, Oct
REC2	Turbidity	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Turbidity	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Conductivity	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Conductivity	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	pH	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	pH	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Nitrogen, ammonia total [as N]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Nitrogen, ammonia total [as N]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Nitrite + Nitrate total [as N]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Nitrite + Nitrate total [as N]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Carbon, dissolved organic [as C]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Carbon, dissolved organic [as C]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Hardness, total [as CaCO3]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Hardness, total [as CaCO3]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Selenium, total recoverable	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Selenium, total recoverable	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Copper, dissolved [as Cu]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Copper, dissolved [as Cu]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Lead, dissolved [as Pb]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Lead, dissolved [as Pb]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Zinc, dissolved [as Zn]	DAILY MX	report only	Apr, Jun, Aug, Oct
REC2	Zinc, dissolved [as Zn]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Mercury, total [as Hg]	INST MAX	report only	Apr, Jun, Aug, Oct
REC2	Mercury, total [as Hg]	INST MAX	report only	Apr, Jun, Aug, Oct