Durango City of — NPDES permit CO0024082: limits, due date and EPA's record

NPDES permit CO0024082 · Major POTW · administratively continued, expires 2024-06-30 · EPA's file as of 2026-09-19

This permit expired on 2024-06-30 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 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (178)

Outfall	Parameter	Statistic	Limit	Months
002	pH	MINIMUM	>= 6.5 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
002	Solids, total suspended	MX 7D AV	<= 45 mg/L	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 10 mg/L	Apr
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 19 mg/L	Feb
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 100 mg/L	Jan
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 8.6 mg/L	Jun
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 110 mg/L	Aug
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 14 mg/L	May
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 12 mg/L	Jul
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 8.6 mg/L	Dec
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 12 mg/L	Mar
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 11 mg/L	Sep
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 70 mg/L	Nov
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 12 mg/L	Oct
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.8 mg/L	Jan
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.9 mg/L	Feb
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 8.6 mg/L	Mar
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 10 mg/L	Jul
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.8 mg/L	Aug
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.3 mg/L	Sep
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 10 mg/L	Nov
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.6 mg/L	Dec
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 9.8 mg/L	Apr
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 13 mg/L	May
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 7.9 mg/L	Jun
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 11 mg/L	Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 28 mg/L	Apr
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 100 mg/L	Feb
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 21 mg/L	Jan
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 56 mg/L	Jun
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 47 mg/L	Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 57 mg/L	May
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 57 mg/L	Jul
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 20 mg/L	Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 24 mg/L	Mar
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 28 mg/L	Sep
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 27 mg/L	Nov
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 26 mg/L	Oct
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 19 mg/L	Jan
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 18 mg/L	Feb
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 22 mg/L	Mar
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 52 mg/L	Jul
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 43 mg/L	Aug
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 26 mg/L	Sep
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 25 mg/L	Nov
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 19 mg/L	Dec
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 25 mg/L	Apr
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 52 mg/L	May
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 51 mg/L	Jun
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 24 mg/L	Oct
002	Nitrogen, ammonia total [as N]	ROLL AVG	<= 15.5 mg/L	Jan
002	Nitrogen, ammonia total [as N]	ROLL AVG	<= 17 mg/L	Aug
002	Nitrogen, ammonia total [as N]	ROLL AVG	<= 11.5 mg/L	Nov
002	Nitrogen, ammonia total [as N]	ROLL AVG	<= 36 mg/L	May
002	Nitrogen, ammonia total [as N]	ROLL AVG	<= 15.3 mg/L	Apr
002	Nitrogen, ammonia total [as N]	ROLL AVG	<= 39 mg/L	Jun
002	Nitrogen, inorganic total	DAILY MX	report only	all year
002	Nitrogen, inorganic total	DAILY MX	<= 25 mg/L	all year
002	Nitrogen, inorganic total	RM	report only	all year
002	Nitrogen, inorganic total	95th %	report only	all year
002	Phosphorus, total [as P]	RM	report only	all year
002	Phosphorus, total [as P]	ANNL MEDN	<= 3.2 mg/L	all year
002	Phosphorus, total [as P]	ANNL MEDN	report only	all year
002	Phosphorus, total [as P]	95th %	report only	all year
002	Cyanide, weak acid, dissociable	DAILY MX	report only	all year
002	Cyanide, total [as CN]	DAILY MX	report only	all year
002	Chloride [as Cl]	30DA AVG	report only	all year
002	Arsenic, total recoverable	30DA AVG	<= .65 ug/L	all year
002	Arsenic, total recoverable	30DA AVG	<= .85 ug/L	all year
002	Iron, total recoverable	30DA AVG	report only	all year
002	Iron, total recoverable	ROLL AVG	report only	all year
002	Arsenic, total [as As]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Iron, dissolved [as Fe]	30DA AVG	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Manganese, dissolved [as Mn]	30DA AVG	report only	all year
002	Manganese, dissolved [as Mn]	DAILY MX	report only	all year
002	Molybdenum, total [as Mo]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Nickel, total recoverable	30DA AVG	report only	all year
002	Nickel, total recoverable	ROLL AVG	report only	all year
002	Silver, total [as Ag]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Cadmium, total recoverable	DAILY MX	report only	all year
002	Cadmium, total recoverable	ROLL AVG	report only	all year
002	Lead, total recoverable	30DA AVG	report only	all year
002	Lead, total recoverable	DAILY MX	report only	all year
002	Lead, total recoverable	DAILY MX	report only	all year
002	Lead, total recoverable	ROLL AVG	report only	all year
002	Molybdenum, total recoverable	30DA AVG	report only	all year
002	Molybdenum, total recoverable	ROLL AVG	report only	all year
002	Selenium, total [as Se]	DAILY MX	report only	all year
002	Chromium, hexavalent dissolved [as Cr]	30DA AVG	report only	all year
002	Chromium, hexavalent dissolved [as Cr]	DAILY MX	report only	all year
002	Zinc, potentially dissolved	30DA AVG	report only	all year
002	Zinc, potentially dissolved	DAILY MX	report only	all year
002	Zinc, potentially dissolved	ROLL AVG	report only	all year
002	Silver, potentially dissolved	30DA AVG	report only	all year
002	Silver, potentially dissolved	DAILY MX	report only	all year
002	Copper, potentially dissolved	30DA AVG	report only	all year
002	Copper, potentially dissolved	DAILY MX	report only	all year
002	Copper, potentially dissolved	DAILY MX	report only	all year
002	Copper, potentially dissolved	ROLL AVG	report only	all year
002	Aluminum, potentially dissolvd	30DA AVG	report only	all year
002	Aluminum, potentially dissolvd	DAILY MX	report only	all year
002	Aluminum, potentially dissolvd	DAILY MX	report only	all year
002	Aluminum, potentially dissolvd	ROLL AVG	report only	all year
002	Arsenic, potentially dissolved	DAILY MX	report only	all year
002	Cadmium, potentially dissolvd	30DA AVG	report only	all year
002	Cadmium, potentially dissolvd	30DA AVG	<= 12 ug/L	all year
002	Cadmium, potentially dissolvd	30DA AVG	report only	all year
002	Cadmium, potentially dissolvd	DAILY MX	report only	all year
002	Cadmium, potentially dissolvd	DAILY MX	<= 60 ug/L	all year
002	Cadmium, potentially dissolvd	DAILY MX	<= 60 ug/L	all year
002	Cadmium, potentially dissolvd	ROLL AVG	<= .29 ug/L	all year
002	Chromium, trivalent, potentially dissolvd	30DA AVG	report only	all year
002	Lead, potentially dissolvd	30DA AVG	report only	all year
002	Lead, potentially dissolvd	30DA AVG	<= .91 ug/L	all year
002	Lead, potentially dissolvd	DAILY MX	report only	all year
002	Lead, potentially dissolvd	DAILY MX	<= 2888 ug/L	all year
002	Manganese, potentially dissolvd	30DA AVG	report only	all year
002	Manganese, potentially dissolvd	DAILY MX	report only	all year
002	Manganese, potentially dissolvd	ROLL AVG	report only	all year
002	Nickel, potentially dissolvd	30DA AVG	report only	all year
002	Nickel, potentially dissolvd	DAILY MX	report only	all year
002	Nickel, potentially dissolvd	ROLL AVG	report only	all year
002	Selenium, potentially dissolvd	30DA AVG	report only	all year
002	Selenium, potentially dissolvd	DAILY MX	report only	all year
002	Total phenols	DAILY MX	report only	all year
002	Chromium, trivalent total recoverable	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	30DA AVG	<= 3 MGD	all year
002	Flow, in conduit or thru treatment plant	30DA AVG	<= 3.28 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Chlorine, total residual	30DA AVG	<= .09 mg/L	all year
002	Chlorine, total residual	30DA AVG	<= .082 mg/L	all year
002	Chlorine, total residual	INST MAX	<= .43 mg/L	all year
002	Chlorine, total residual	INST MAX	<= .3 mg/L	all year
002	Mercury, total [low level]	30DA AVG	report only	all year
002	Mercury, total [low level]	30DA AVG	<= .26 ug/L	all year
002	Mercury, total [low level]	ROLL AVG	report only	all year
002	Mercury, total [low level]	ROLL AVG	<= .039 ug/L	all year
002	E. coli	30DA GM	<= 1920 #/100mL	all year
002	E. coli	30DA GM	<= 1756 #/100mL	all year
002	E. coli	MX 7D GM	<= 3840 #/100mL	all year
002	E. coli	MX 7D GM	<= 3512 #/100mL	all year
002	Sulfide-hydrogen sulfide [undissociated]	30DA AVG	report only	all year
002	Nitrogen, Total As N	ANNL MEDN	<= 35 mg/L	all year
002	Nonylphenol	30DA AVG	report only	all year
002	Nonylphenol	DAILY MX	report only	all year
002	Nonylphenol	ROLL AVG	report only	all year
002	Solids, total dissolved	30DA AVG	report only	all year
002	Solids, total dissolved	DAILY MX	report only	all year
002	Solids, total dissolved	30DA AVG	report only	all year
002	Solids, total dissolved	DAILY MX	report only	all year
002	Mercury, total [as Hg]	DAILY MX	report only	all year
002	BOD, carbonaceous [5 day, 20 C]	30DA AVG	<= 25 mg/L	all year
002	BOD, carbonaceous [5 day, 20 C]	MX 7D AV	<= 40 mg/L	all year
002	BOD, carb-5 day, 20 deg C, percent removal	MO AV MN	>= 85 %	all year
002	Solids, suspended percent removal	MO AV MN	>= 85 %	all year
002	Sulfate	30DA AVG	report only	all year
002	Oil and grease visual	INST MAX	report only	all year
002	LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia	MN VALUE	>= 100 %	all year
002	LC50 Static Renewal 96Hr Acute Pimephales promelas	MN VALUE	>= 100 %	all year
300	Plant capacity fact. percent of capacity	30DA AVG	report only	all year
300	Plant capacity fact. percent of capacity	30DA AVG	report only	all year
300	Solids, total suspended	30DA AVG	report only	all year
300	Solids, total suspended	MX 7D AV	report only	all year
300	Flow, in conduit or thru treatment plant	30DA AVG	report only	all year
300	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
300	BOD, carbonaceous [5 day, 20 C]	30DA AVG	report only	all year
300	BOD, carbonaceous [5 day, 20 C]	MX 7D AV	report only	all year
300	BOD, carbonaceous [5 day, 20 C]	30DA AVG	report only	all year
300	BOD, carbonaceous [5 day, 20 C]	MX 7D AV	report only	all year