Rio Grande Silver Inc

NPDES permit CO0048960 · Minor NON-POTW · effective, expires 2031-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

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

EPA's file shows no filings for this permit in this window. That is a statement about the file, not about the facility.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among CO permits in EPA's filings — check your permit).

Limits in force (113)

OutfallParameterStatisticLimitMonths
001Solids, total suspended30DA AVG <= 20 mg/L all year
001Solids, total suspendedDAILY MX <= 30 mg/L all year
001Arsenic, total recoverable30DA AVG <= 3 ug/L all year
001Iron, total recoverable30DA AVG <= 1000 ug/L all year
001Thallium, total recoverable30DA AVG report only all year
001Beryllium, total recoverable [as Be]30DA AVG report only all year
001Barium, total recoverable30DA AVG report only all year
001Barium, total recoverableDAILY MX report only all year
001Manganese, dissolved [as Mn]30DA AVG <= 50 ug/L all year
001Thallium, dissolved [as Tl]30DA AVG report only all year
001Nickel, total recoverable30DA AVG report only all year
001Zinc, total recoverable30DA AVG <= 750 ug/L all year
001Zinc, total recoverableDAILY MX <= 1500 ug/L all year
001Aluminum, total recoverable30DA AVG <= 767 ug/L all year
001Aluminum, total recoverableDAILY MX <= 1471 ug/L all year
001Cadmium, total recoverable30DA AVG <= 50 ug/L all year
001Cadmium, total recoverableDAILY MX <= 100 ug/L all year
001Lead, total recoverable30DA AVG <= 300 ug/L all year
001Lead, total recoverableDAILY MX <= 600 ug/L all year
001Copper, total recoverable30DA AVG <= 150 ug/L all year
001Copper, total recoverableDAILY MX <= 300 ug/L all year
001Chromium, hexavalent dissolved [as Cr]30DA AVG report only all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
001Zinc, potentially dissolved30DA AVG <= 1558 ug/L Apr, May, Jun, Jul
001Zinc, potentially dissolved30DA AVG <= 164 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Zinc, potentially dissolvedDAILY MX <= 1940 ug/L Apr, May, Jun, Jul
001Zinc, potentially dissolvedDAILY MX <= 857 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Silver, potentially dissolved30DA AVG <= .56 ug/L all year
001Silver, potentially dissolvedDAILY MX <= .7 ug/L all year
001Copper, potentially dissolved30DA AVG <= 5.3 ug/L Apr, May, Jun, Jul
001Copper, potentially dissolved30DA AVG <= 12 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Copper, potentially dissolvedDAILY MX <= 7.5 ug/L Apr, May, Jun, Jul
001Copper, potentially dissolvedDAILY MX <= 18 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Beryllium, potentially dissolvd30DA AVG <= .5 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Beryllium, potentially dissolvdDAILY MX <= .83 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Cadmium, potentially dissolvd30DA AVG <= 5.9 ug/L Apr, May, Jun, Jul
001Cadmium, potentially dissolvdDAILY MX <= 7.1 ug/L Apr, May, Jun, Jul
001Cadmium, potentially dissolvd30DA AVG <= .5 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Cadmium, potentially dissolvdDAILY MX <= .83 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Chromium, trivalent, potentially dissolvd30DA AVG report only all year
001Chromium, trivalent, potentially dissolvdDAILY MX report only all year
001Lead, potentially dissolvd30DA AVG <= 1.68 ug/L Apr, May, Jun, Jul
001Lead, potentially dissolvd30DA AVG <= 3.6 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Lead, potentially dissolvdDAILY MX <= 33 ug/L Apr, May, Jun, Jul
001Lead, potentially dissolvdDAILY MX <= 92 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Manganese, potentially dissolvd30DA AVG <= 1343 ug/L Apr, May, Jun, Jul
001Manganese, potentially dissolvd30DA AVG <= 1429 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Manganese, potentially dissolvdDAILY MX <= 2462 ug/L Apr, May, Jun, Jul
001Manganese, potentially dissolvdDAILY MX <= 3332 ug/L Jan, Feb, Mar, Aug, Sep, Oct, Nov, Dec
001Nickel, potentially dissolvd30DA AVG report only all year
001Nickel, potentially dissolvdDAILY MX report only all year
001Selenium, potentially dissolvd30DA AVG <= 4.6 ug/L all year
001Selenium, potentially dissolvdDAILY MX <= 18 ug/L all year
001Uranium, potentially dissolvd30DA AVG report only all year
001Uranium, potentially dissolvdDAILY MX report only all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Chromium, trivalent total recoverable30DA AVG report only all year
001Radium 226 & 228, dissolved30DA AVG report only all year
001Radium 226 + radium 228, total30DA AVG report only all year
001Uranium, total30DA AVG report only all year
001Chlorine, total residual30DA AVG <= .011 mg/L all year
001Chlorine, total residualINST MAX <= .019 mg/L all year
001Mercury, total [low level]30DA AVG <= .01 ug/L all year
001Mercury, total [low level]DAILY MX <= 2 ug/L all year
001Sulfide-hydrogen sulfide [undissociated]30DA AVG report only all year
001Sulfate30DA AVG report only all year
001Oil and grease visualINST MAX report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaSINGSAMP report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE report only all year
001Static Renewal 7 Day Chronic Ceriodaphnia dubiaMN VALUE >= 100 tox chronic all year
001Static Renewal 7 Day Chronic Pimephales promelasSINGSAMP report only all year
001Static Renewal 7 Day Chronic Pimephales promelasMN VALUE report only all year
001Static Renewal 7 Day Chronic Pimephales promelasMN VALUE >= 100 tox chronic all year
002Area inspection visualINST MAX report only all year
002Area inspection visualINST MAX report only Dec
003pHMINIMUM >= 6.5 SU all year
003pHMAXIMUM <= 9 SU all year
003Arsenic, total recoverable30DA AVG report only all year
003Iron, total recoverable30DA AVG report only all year
003Iron, dissolved [as Fe]30DA AVG report only all year
003Manganese, dissolved [as Mn]30DA AVG report only all year
003Nickel, total recoverable30DA AVG report only all year
003Cadmium, total recoverable30DA AVG report only all year
003Lead, total recoverableDAILY MX report only all year
003Chromium, hexavalent dissolved [as Cr]30DA AVG report only all year
003Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
003Zinc, potentially dissolved30DA AVG report only all year
003Zinc, potentially dissolvedDAILY MX report only all year
003Silver, potentially dissolved30DA AVG report only all year
003Silver, potentially dissolvedDAILY MX report only all year
003Copper, potentially dissolved30DA AVG report only all year
003Copper, potentially dissolvedDAILY MX report only all year
003Cadmium, potentially dissolvd30DA AVG report only all year
003Cadmium, potentially dissolvdDAILY MX report only all year
003Chromium, trivalent, potentially dissolvd30DA AVG report only all year
003Chromium, trivalent, potentially dissolvdDAILY MX report only all year
003Lead, potentially dissolvd30DA AVG report only all year
003Lead, potentially dissolvdDAILY MX report only all year
003Manganese, potentially dissolvd30DA AVG report only all year
003Manganese, potentially dissolvdDAILY MX report only all year
003Nickel, potentially dissolvd30DA AVG report only all year
003Nickel, potentially dissolvdDAILY MX report only all year
003Selenium, potentially dissolvd30DA AVG report only all year
003Selenium, potentially dissolvdDAILY MX report only all year
003Chromium, trivalent total recoverable30DA AVG report only all year
003Mercury, total low level30DA AVG report only all year
003Area inspection visualINST MAX report only all year
003Area inspection visualINST MAX report only Dec
004Area inspection visualINST MAX report only all year
004Area inspection visualINST MAX report only Dec
005Area inspection visualINST MAX report only all year
005Area inspection visualINST MAX report only Dec
006Area inspection visualINST MAX report only Dec

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states