Silverton Town of

NPDES permit CO0020311 · Minor POTW · administratively continued, expires 2024-06-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

2values over a limit
0required values missing, on 0 form(s)
0of 27 forms filed late

Last period with anything received: 2026-08-31. Most often over: Lead, potentially dissolvd (1), Chlorine, total residual (1).

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 (72)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
001pHMINIMUM >= 6 SU Jan
001pHMINIMUM >= 6 SU Feb
001pHMINIMUM >= 6.2 SU Mar
001pHMINIMUM >= 6.5 SU Apr
001pHMINIMUM >= 6.5 SU May
001pHMINIMUM >= 6.5 SU Jun
001pHMINIMUM >= 6.5 SU Jul
001pHMINIMUM >= 6.5 SU Aug
001pHMINIMUM >= 6.5 SU Sep
001pHMINIMUM >= 6.5 SU Oct
001pHMINIMUM >= 6.5 SU Nov
001pHMINIMUM >= 6 SU Dec
001pHMAXIMUM <= 9 SU Jan
001pHMAXIMUM <= 9 SU Feb
001pHMAXIMUM <= 9 SU Mar
001pHMAXIMUM <= 9 SU Apr
001pHMAXIMUM <= 9 SU May
001pHMAXIMUM <= 9 SU Jun
001pHMAXIMUM <= 9 SU Jul
001pHMAXIMUM <= 9 SU Aug
001pHMAXIMUM <= 9 SU Sep
001pHMAXIMUM <= 9 SU Oct
001pHMAXIMUM <= 9 SU Nov
001pHMAXIMUM <= 9 SU Dec
001Solids, total suspended30DA AVG <= 75 mg/L all year
001Solids, total suspendedMX 7D AV <= 110 mg/L all year
001Nitrogen, ammonia total [as N]30DA AVG <= 65 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 65 mg/L all year
001Iron, total recoverable30DA AVG report only all year
001Iron, total recoverable30DA AVG <= 1286 ug/L Jul
001Iron, total recoverable30DA AVG report only Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec
001Iron, total recoverableDAILY MX report only all year
001Aluminum, total recoverable30DA AVG report only all year
001Aluminum, total recoverableDAILY MX report only all year
001Zinc, potentially dissolved30DA AVG report only all year
001Zinc, potentially dissolvedDAILY MX report only all year
001Copper, potentially dissolved30DA AVG report only all year
001Copper, potentially dissolvedDAILY MX report only all year
001Cadmium, potentially dissolvd30DA AVG <= 1.1 ug/L all year
001Cadmium, potentially dissolvdDAILY MX <= 3 ug/L all year
001Lead, potentially dissolvd30DA AVG report only all year
001Lead, potentially dissolvd30DA AVG report only all year
001Lead, potentially dissolvd30DA AVG <= 4.6 ug/L all year
001Lead, potentially dissolvdDAILY MX report only all year
001Lead, potentially dissolvdDAILY MX report only all year
001Lead, potentially dissolvdDAILY MX report only all year
001Manganese, potentially dissolvd30DA AVG report only all year
001Manganese, potentially dissolvdDAILY MX report only all year
001Oil and greaseINST MAX <= 10 mg/L all year
001Flow, in conduit or thru treatment plant30DA AVG <= .42 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualINST MAX <= .5 mg/L all year
001E. coli30DA GM <= 2000 #/100mL all year
001E. coliMX 7D GM <= 4000 #/100mL all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolved30DA AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Oil and grease visualINST MAX report only all year
300Plant capacity fact. percent of capacity30DA AVG report only all year
300Plant capacity fact. percent of capacity30DA AVG report only all year
300BOD, 5-day, 20 deg. C30DA AVG report only all year
300BOD, 5-day, 20 deg. CMX 7D AV report only all year
300BOD, 5-day, 20 deg. C30DA AVG report only all year
300BOD, 5-day, 20 deg. CMX 7D AV report only all year
300Solids, total suspended30DA AVG report only all year
300Solids, total suspendedMX 7D AV report only all year
300Flow, in conduit or thru treatment plant30DA AVG report only all year
300Flow, in conduit or thru treatment plantDAILY MX report only all year

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