ASH GROVE CEMENT COMPANY

NPDES permit MT0000451 · Minor NON-POTW · administratively continued, expires 2024-01-31 · 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.

This permit expired on 2024-01-31 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 34 forms filed late

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

Reporting

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

Limits in force (63)

OutfallParameterStatisticLimitMonths
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001Sulfate [as S]MO AVG report only all year
001Sulfate [as S]DAILY MX report only all year
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 50 mg/L all year
001Solids, total suspendedDAILY MX <= 50 mg/L all year
001Solids, total suspendedMO AVG <= 3 lb/d all year
001Oil and grease, hexane extr methodSINGSAMP report only all year
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrogen, total [as N]DAILY MX report only Jul, Aug, Sep
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrogen, ammonia total [as N]VALUE report only all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrogen, Kjeldahl, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrite + Nitrate total [as N]VALUE report only all year
001Nitrite + Nitrate total [as N]MO AVG report only Jul, Aug, Sep
001Nitrite + Nitrate total [as N]MO AVG report only Jul, Aug, Sep
001Hardness, total [as CaCO3]VALUE report only all year
001Sulfate, total [as SO4]VALUE report only all year
001Arsenic, total recoverableMO AVG report only all year
001Arsenic, total recoverableDAILY MX report only all year
001Arsenic, total recoverableVALUE report only all year
001Zinc, total recoverableMO AVG report only all year
001Zinc, total recoverableDAILY MX report only all year
001Zinc, total recoverableVALUE report only all year
001Lead, total recoverableMO AVG report only all year
001Lead, total recoverableDAILY MX report only all year
001Lead, total recoverableVALUE report only all year
001Copper, total recoverableMO AVG report only all year
001Copper, total recoverableDAILY MX report only all year
001Copper, total recoverableVALUE report only all year
001DurationVALUE report only all year
001Oil and grease visualVALUE report only all year
002Flow rateMO AVG report only all year
002Flow rateDAILY MX report only all year
002Sulfate [as S]MO AVG report only all year
002Sulfate [as S]DAILY MX report only all year
002pHINST MIN >= 6 SU all year
002pHINST MAX <= 9 SU all year
002Solids, total suspendedMO AVG <= 50 mg/L all year
002Solids, total suspendedDAILY MX <= 50 mg/L all year
002Solids, total suspendedMO AVG <= 13.3 lb/d all year
002Oil and grease, hexane extr methodSINGSAMP report only all year
002Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
002Nitrogen, total [as N]DAILY MX report only Jul, Aug, Sep
002Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
002Nitrogen, ammonia total [as N]VALUE report only all year
002Nitrogen, Kjeldahl, total [as N]MO AVG report only Jul, Aug, Sep
002Nitrite + Nitrate total [as N]VALUE report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
002Nitrite + Nitrate total [as N]MO AVG report only Jul, Aug, Sep
002Arsenic, total recoverableMO AVG report only all year
002Arsenic, total recoverableDAILY MX report only all year
002Zinc, total recoverableMO AVG report only all year
002Zinc, total recoverableDAILY MX report only all year
002Lead, total recoverableMO AVG report only all year
002Lead, total recoverableDAILY MX report only all year
002Copper, total recoverableMO AVG report only all year
002Copper, total recoverableDAILY MX report only all year
002DurationVALUE report only all year
002Oil and grease visualVALUE 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