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Clean Water Act discharge permit · NPDES COG591197

SAN SOUCI MHP, Boulder, CO: NPDES COG591197 discharge permit, effluent exceedances, inspections, penalties

SAN SOUCI MHP, held by Sans Souci Cooperative, holds NPDES permit COG591197, which discharges to South Boulder Creek. EPA’s file records it issued January 17, 2024 and expiring December 31, 2028. 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 filedSAN SOUCI MHP
Permittee as filedSans Souci Cooperative
NPDES IDCOG591197
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedJanuary 17, 2024
Expiration dateDecember 31, 2028
AddressBoulder, CO 80305
Receiving waterSouth Boulder Creek
Receiving water impaired303(D) Listed
SubwatershedLower South Boulder Creek (HUC 101900050504)

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; the 60 with the most exceedances of 80 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Nitrogen, ammonia total [as N]644528June 30, 2026387% over the limit
Solids, total suspended44824June 30, 2026227% over the limit
E. coli43119June 30, 202699,999% over the limit
Solids, suspended percent removal12216May 31, 2026385% over the limit
BOD, 5-day, percent removal11711June 30, 2026400% over the limit
Sulfide-hydrogen sulfide [undissociated]21610June 30, 2026127,567% over the limit
Arsenic, total recoverable3159May 31, 202626,000% over the limit
Chloride [as Cl]2159June 30, 2026566% over the limit
BOD, 5-day, 20 deg. C6437June 30, 202690% over the limit
Silver, potentially dissolved3162April 30, 2026567% over the limit
Temperature, water deg. centigrade4240
Flow, in conduit or thru treatment plant4240
Chromium, hexavalent dissolved [as Cr]2140
Zinc, potentially dissolved2140
Copper, potentially dissolved2140
Cadmium, potentially dissolvd2140
Lead, potentially dissolvd2140
Manganese, potentially dissolvd2140
Nickel, potentially dissolvd2140
Selenium, potentially dissolvd2140
Chlorine, total residual4120
Plant capacity fact. percent of capacity2120
pH2120
Iron, total recoverable170
Iron, dissolved [as Fe]170
Manganese, dissolved [as Mn]170
Nickel, total recoverable170
Cadmium, total recoverable170
Lead, total recoverable170
Molybdenum, total recoverable170
Arsenic, potentially dissolved170
Chromium, trivalent, potentially dissolvd170
Chromium, trivalent total recoverable170
Mercury, total [low level]170
Nitrogen, inorganic total260
Nitrogen, nitrite total [as N]160
Oil and grease160
Sulfate160
Oil and grease visual160
Perfluorooctanoic acid (PFOA)240
Perfluorobutanoic acid (PFBA)240
Perfluorooctanesulfonamide (PFOSA)240
Perfluoropentanoic acid (PFPeA)240
Perfluorohexanoic acid (PFHxA)240
Perfluoroheptanoic acid (PFHpA)240
Perfluorononanoic acid (PFNA)240
Perfluorodecanoic acid (PFDA)240
Perfluoroundecanoic acid (PFUnA)240
Perfluorododecanoic acid (PFDoA)240
Perfluorotridecanoic acid (PFTrDA)240
Perfluorotetradecanoic acid (PFTeDA)240
N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE)240
N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE)240
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)240
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)240
Perfluorobutanesulfonic acid (PFBS)240
Perfluorodecanesulfonic acid (PFDS)240
Perfluoroheptanesulfonic acid (PFHpS)240
Perfluorohexanesulfonic acid (PFHxS)240
Perfluorooctanesulfonic acid (PFOS)240

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 25, 2024WW SSO - Overflow to Dry Land or Building BackupST6

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 NPDES discharge permit COG591197 for SAN SOUCI MHP in Boulder, CO, held by Sans Souci Cooperative and discharging to South Boulder Creek, which is listed as impaired under 303(D). The page lists 80 pollutants on file, 80 under a numeric limit, 80 with a violation of any kind, and 10 with an effluent exceedance.