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Clean Water Act discharge permit · NPDES MO0097837

COLUMBIA WWTP, Columbia, MO: NPDES MO0097837 discharge permit, effluent exceedances, inspections, penalties

COLUMBIA WWTP, held by City of Columbia, holds NPDES permit MO0097837, which discharges to Tributary To Perche Cr.. EPA’s file records it issued July 1, 2020 and expiring June 30, 2025. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedCOLUMBIA WWTP
Permittee as filedCity of Columbia
NPDES IDMO0097837
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJuly 1, 2020
Expiration dateJune 30, 2025
AddressColumbia, MO 65203
Receiving waterTributary to Perche Cr.
Receiving water impaired303(D) Listed
SubwatershedLower Hinkson Creek (HUC 103001020603)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH2694115September 30, 2019
Solids, total suspended540171May 31, 2025582% over the limit
Nitrogen, nitrate total [as NO3]05912September 30, 2009124% over the limit
Mercury, total recoverable01335March 31, 202014,925% over the limit
Selenium, total recoverable0284September 30, 2011308% over the limit
Solids, settleable064June 30, 201212,900% over the limit
Cadmium, total recoverable01293March 31, 2013200% over the limit
Copper, total recoverable01292March 31, 2013110% over the limit
Nickel, total recoverable01281September 30, 201818% over the limit
Lead, total recoverable01261September 30, 2018236% over the limit
BOD, 5-day, 20 deg. C3671February 28, 200644% over the limit
Cyanide, free [amenable to chlorination]0251December 31, 201925% over the limit
Oil and grease [soxhlet extr.] tot.211February 28, 201810% over the limit
Solids, suspended percent removal111July 31, 202113% over the limit
Water level at sample collection time03250
Nitrogen, nitrate [NO3], [water]02610
Nitrogen, ammonia total [as N]32600
Solids, total dissolved02160
Silver total recoverable01290
Zinc, total recoverable01280
Manganese, total recoverable0910
Arsenic, total recoverable0610
Nitrogen, total [as N]0520
Conductivity, net0520
Solids, total dissolved- 180 deg. C0450
Aluminum, total recoverable0250
Molybdenum, total recoverable0250
Flow, in conduit or thru treatment plant2220
Nitrogen, nitrate total [as N]0200
Specific conductance0140
Chromium, hexavalent dissolved [as Cr]0140
Chromium, trivalent total recoverable0140
Cyanide, total recoverable0100
Lagoon freeboard0100
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia020
LC50 Static 48Hr Acute Pimephales promelas020
Nitrogen, Kjeldahl, total [as N]300
Nitrite + Nitrate total [as N]300
Phosphorus, total [as P]300
Temperature, water deg. centigrade200
E. coli200
BOD, 5-day, percent removal100

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

DateWhat EPA recordedAgency
May 17, 2022Permit Violations - Unapproved OperationST6
May 17, 2022Effluent Violations - Unauthorized DischargeST6
October 8, 2019Effluent Violations - Numeric effluent violationST6

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

This public-records page covers the Clean Water Act discharge permit NPDES MO0097837 for COLUMBIA WWTP in Columbia, MO, held by City of Columbia, which discharges to Tributary To Perche Cr. The register lists 42 pollutants on file, 13 of them under a numeric limit, and 14 with an effluent exceedance. The Lower Hinkson Creek subwatershed (HUC 103001020603) is cited, and the permit is shown as effective, with the status as of September 15, 2026.