Colo Div of Reclamation, Mining and Safety — NPDES permit CO0001244: limits, due date and EPA's record

Uranium-Radium-Vanadium Ores, Golden, Colorado. NPDES permit CO0001244 expired Dec 31, 2015; its limits still apply. Last 12 months: over a limit 4 times (last July 2026), 1 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period ending	Parameter	Reported	Limit	Over by
October 2025	Arsenic, total recoverable, 30-day average	9 ug/L	≤ .02 ug/L	44900%
May 2026	Arsenic, total recoverable, 30-day average	50.5 ug/L	≤ .02 ug/L	—
June 2026	Arsenic, total recoverable, 30-day average	6.5 ug/L	≤ .02 ug/L	32400%
July 2026	Arsenic, total recoverable, 30-day average	1 ug/L	≤ .02 ug/L	4900%

Limits in force (73)

Parameter	Statistic	Limit	Months
Oxygen demand, chem. [high level] [COD]	30-day average	≤ 100 mg/L	all year
Oxygen demand, chem. [high level] [COD]	daily maximum	≤ 200 mg/L	all year
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	30-day average	≤ 20 mg/L	all year
Solids, total suspended	daily maximum	≤ 30 mg/L	all year
Cyanide, weak acid, dissociable	daily maximum	≤ 5 ug/L	all year
Cyanide, weak acid, dissociable	rolling average	≤ .75 ug/L	all year
Chloride [as Cl]	30-day average	≤ 250 mg/L	all year
Chloride [as Cl]	rolling average	≤ 54 mg/L	all year
Sulfate, total [as SO4]	30-day average	≤ 250 mg/L	all year
Sulfate, total [as SO4]	rolling average	≤ 131 mg/L	all year
Fluoride	daily maximum	≤ 2 mg/L	all year
Arsenic, total recoverable	30-day average	≤ .02 ug/L	all year
Arsenic, total recoverable	30-day average	report only (ug/L)	all year
Iron, total recoverable	30-day average	report only (ug/L)	all year
Iron, total recoverable	rolling average	report only (ug/L)	all year
Boron, total [as B]	30-day average	≤ .75 mg/L	all year
Boron, total [as B]	30-day average	≤ .46 mg/L	all year
Boron, total [as B]	daily maximum	report only (mg/L)	all year
Iron, dissolved [as Fe]	30-day average	≤ 300 ug/L	all year
Iron, dissolved [as Fe]	rolling average	≤ 45 ug/L	all year
Manganese, dissolved [as Mn]	30-day average	≤ 50 ug/L	all year
Manganese, dissolved [as Mn]	rolling average	≤ 7.5 ug/L	all year
Thallium, total [as Tl]	30-day average	≤ .24 ug/L	all year
Antimony, total [as Sb]	30-day average	≤ 5.6 ug/L	all year
Chromium, hexavalent dissolved [as Cr]	30-day average	report only (ug/L)	all year
Chromium, hexavalent dissolved [as Cr]	daily maximum	report only (ug/L)	all year
Zinc, potentially dissolved	30-day average	report only (ug/L)	all year
Zinc, potentially dissolved	daily maximum	report only (ug/L)	all year
Zinc, potentially dissolved	rolling average	report only (ug/L)	all year
Silver, potentially dissolved	30-day average	≤ .13 ug/L	all year
Silver, potentially dissolved	daily maximum	≤ 3.5 ug/L	all year
Silver, potentially dissolved	rolling average	≤ .02 ug/L	all year
Copper, potentially dissolved	30-day average	≤ 12 ug/L	all year
Copper, potentially dissolved	daily maximum	≤ 18 ug/L	all year
Copper, potentially dissolved	rolling average	≤ 1.8 ug/L	all year
Cadmium, potentially dissolvd	30-day average	report only (ug/L)	all year
Cadmium, potentially dissolvd	daily maximum	report only (ug/L)	all year
Nickel, potentially dissolvd	30-day average	report only (ug/L)	all year
Nickel, potentially dissolvd	daily maximum	report only (ug/L)	all year
Nickel, potentially dissolvd	rolling average	report only (ug/L)	all year
Selenium, potentially dissolvd	30-day average	report only (ug/L)	all year
Selenium, potentially dissolvd	daily maximum	report only (ug/L)	all year
Selenium, potentially dissolvd	rolling average	report only (ug/L)	all year
Oil and grease	instantaneous maximum	≤ 10 mg/L	all year
Chromium, trivalent total recoverable	daily maximum	≤ 50 ug/L	all year
Chromium, trivalent total recoverable	rolling average	≤ 7.5 ug/L	all year
Radium 226, total	30-day average	≤ 10 pCi/L	all year
Radium 226, total	daily maximum	≤ 30 pCi/L	all year
Radium 226, dissolved	30-day average	≤ 3 pCi/L	all year
Radium 226, dissolved	daily maximum	≤ 10 pCi/L	all year
Radium 226 + radium 228, total	30-day average	≤ 5 pCi/L	all year
Uranium, total	30-day average	≤ 30 ug/L	all year
Uranium, total	rolling average	≤ 22 ug/L	all year
Flow, in conduit or thru treatment plant	30-day average	≤ .288 MGD	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
Sulfide-hydrogen sulfide [undissociated]	30-day average	report only (mg/L)	all year
Sulfide-hydrogen sulfide [undissociated]	rolling average	report only (mg/L)	all year
Toxicity [chronic], Ceriodaphnia dubia	minimum value	report only (tox chronic)	all year
Toxicity [chronic], Ceriodaphnia dubia	minimum value	report only (tox chronic)	all year
Toxicity [chronic], Pimephales promelas [Fathead Minnow]	minimum value	report only (tox chronic)	all year
Toxicity [chronic], Pimephales promelas [Fathead Minnow]	minimum value	report only (tox chronic)	all year
Solids, total dissolved	30-day average	report only (mg/L)	all year
Solids, total dissolved	daily maximum	report only (mg/L)	all year
Mercury, total [as Hg]	30-day average	report only (ug/L)	all year
Oil and grease visual	instantaneous maximum	report only (N=0;Y=1)	all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	minimum value	report only (%)	all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	minimum value	report only (%)	all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia	minimum value	≥ 100 %	all year
%Effect Static Renewal 7Day Chronic Pimephales promelas	minimum value	report only (%)	all year
%Effect Static Renewal 7Day Chronic Pimephales promelas	minimum value	report only (%)	all year
%Effect Static Renewal 7Day Chronic Pimephales promelas	minimum value	≥ 100 %	all year

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/CO0001244 · MCP: https://passage-data.com/mcp