Costilla County Water and Sanitation District

NPDES permit CO0036528 · Minor POTW · administratively continued, expires 2019-06-30 · 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.

This permit expired on 2019-06-30 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

0values over a limit
0required values missing, on 0 form(s)
0of 22 forms filed late

Last period with anything received: 2026-07-31.

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 (100)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001BOD, 5-day, 20 deg. C30DA AVG <= 54 lb/d Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. C30DA AVG <= 33 lb/d Jan, Feb, Mar, Oct, Nov, Dec
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
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 <= 46 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 43 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 32 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 27.6 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 19.1 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 18.6 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 19 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG report only Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 6.2 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 22.2 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 24.2 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 34 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 6.6 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 83 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 67 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 58 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 128 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 106 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 132 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 55 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 51 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 51 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 55 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 54 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 58 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 51 mg/L Aug
001Oil and greaseINST MAX <= 10 mg/L all year
001Flow, in conduit or thru treatment plant30DA AVG <= .13 MGD Feb
001Flow, in conduit or thru treatment plant30DA AVG <= .216 MGD Sep
001Flow, in conduit or thru treatment plant30DA AVG <= .13 MGD Nov
001Flow, in conduit or thru treatment plant30DA AVG <= .13 MGD Jan
001Flow, in conduit or thru treatment plant30DA AVG <= .216 MGD May
001Flow, in conduit or thru treatment plant30DA AVG <= .216 MGD Apr
001Flow, in conduit or thru treatment plant30DA AVG <= .216 MGD Jul
001Flow, in conduit or thru treatment plant30DA AVG <= .216 MGD Aug
001Flow, in conduit or thru treatment plant30DA AVG <= .13 MGD Mar
001Flow, in conduit or thru treatment plant30DA AVG <= .13 MGD Oct
001Flow, in conduit or thru treatment plant30DA AVG <= .216 MGD Jun
001Flow, in conduit or thru treatment plant30DA AVG <= .13 MGD Dec
001Flow, in conduit or thru treatment plantDAILY MX report only Feb
001Flow, in conduit or thru treatment plantDAILY MX report only Sep
001Flow, in conduit or thru treatment plantDAILY MX report only Nov
001Flow, in conduit or thru treatment plantDAILY MX report only Jan
001Flow, in conduit or thru treatment plantDAILY MX report only May
001Flow, in conduit or thru treatment plantDAILY MX report only Apr
001Flow, in conduit or thru treatment plantDAILY MX report only Jul
001Flow, in conduit or thru treatment plantDAILY MX report only Aug
001Flow, in conduit or thru treatment plantDAILY MX report only Mar
001Flow, in conduit or thru treatment plantDAILY MX report only Oct
001Flow, in conduit or thru treatment plantDAILY MX report only Jun
001Flow, in conduit or thru treatment plantDAILY MX report only Dec
001Chlorine, total residual30DA AVG <= .11 mg/L Oct
001Chlorine, total residual30DA AVG <= .11 mg/L Mar
001Chlorine, total residual30DA AVG <= .11 mg/L Nov
001Chlorine, total residual30DA AVG <= .066 mg/L Sep
001Chlorine, total residual30DA AVG <= .066 mg/L Jul
001Chlorine, total residual30DA AVG <= .066 mg/L Apr
001Chlorine, total residual30DA AVG <= .066 mg/L Jun
001Chlorine, total residual30DA AVG <= .11 mg/L Feb
001Chlorine, total residual30DA AVG <= .066 mg/L Aug
001Chlorine, total residual30DA AVG <= .11 mg/L Jan
001Chlorine, total residual30DA AVG <= .066 mg/L May
001Chlorine, total residual30DA AVG <= .11 mg/L Dec
001Chlorine, total residualINST MAX <= .21 mg/L Oct
001Chlorine, total residualINST MAX <= .21 mg/L Mar
001Chlorine, total residualINST MAX <= .21 mg/L Nov
001Chlorine, total residualINST MAX <= .13 mg/L Sep
001Chlorine, total residualINST MAX <= .13 mg/L Jul
001Chlorine, total residualINST MAX <= .13 mg/L Apr
001Chlorine, total residualINST MAX <= .13 mg/L Jun
001Chlorine, total residualINST MAX <= .21 mg/L Feb
001Chlorine, total residualINST MAX <= .13 mg/L Aug
001Chlorine, total residualINST MAX <= .21 mg/L Jan
001Chlorine, total residualINST MAX <= .13 mg/L May
001Chlorine, total residualINST MAX <= .21 mg/L Dec
001E. coli30DA GM <= 1920 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
001E. coli30DA GM <= 1156 #/100mL Apr, May, Jun, Jul, Aug, Sep
001E. coliMX 7D GM <= 4000 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
001E. coliMX 7D GM <= 2040 #/100mL Apr, May, Jun, Jul, Aug, Sep
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