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Las Animas City of

Sewage treatment plant, Las Animas, Colorado. NPDES permit CO0040690 expired Jan 31, 2026; its limits still apply. Last 12 months: over a limit 32 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 003 form A monthly (50 values), outfall 003 form Q quarterly (1 value), outfall 004 form A monthly (54 values), outfall 004 form Q quarterly (6 values), outfall 005 form A monthly (42 values), outfall 005 form Q quarterly (1 value), and 3 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
27 values over a limit, 0 required values missing, 3 of 68 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 32 values over a limit
Period endingOutfallParameterReportedLimitOver by
October 2025004Nitrogen, ammonia total [as N], 30-day average34.4 mg/L≤ 24 mg/L43%
October 2025005Sulfate, 30-day average1744.6 mg/L≤ 902 mg/L93%
October 2025005Uranium, total, 30-day average52.2 ug/L≤ 30 ug/L74%
November 2025004Nitrogen, ammonia total [as N], 30-day average32.5 mg/L≤ 20 mg/L63%
November 2025005Sulfate, 30-day average1871.73 mg/L≤ 902 mg/L108%
November 2025005Uranium, total, 30-day average57.1 ug/L≤ 30 ug/L90%
December 2025004Nitrogen, ammonia total [as N], 30-day average38.8 mg/L≤ 28 mg/L39%
December 2025005Sulfate, 30-day average2051.91 mg/L≤ 902 mg/L127%
December 2025005Uranium, total, 30-day average46.5 ug/L≤ 30 ug/L55%
January 2026005Sulfate, 30-day average1040.04 mg/L≤ 902 mg/L15%
February 2026004Nitrogen, ammonia total [as N], 30-day average42.7 mg/L≤ 28 mg/L53%
February 2026005Sulfate, 30-day average2195.84 mg/L≤ 902 mg/L143%
February 2026005Uranium, total, 30-day average55.1 ug/L≤ 30 ug/L84%
March 2026004Nitrogen, ammonia total [as N], 30-day average37.4 mg/L≤ 21 mg/L78%
March 2026005Sulfate, 30-day average1666.79 mg/L≤ 902 mg/L85%
March 2026005Uranium, total, 30-day average62.6 ug/L≤ 30 ug/L109%
April 2026004Nitrogen, ammonia total [as N], 30-day average39.1 mg/L≤ 18 mg/L117%
April 2026005Sulfate, 30-day average2035.45 mg/L≤ 902 mg/L126%
April 2026005Uranium, total, 30-day average56.6 ug/L≤ 30 ug/L89%
May 2026004Nitrogen, ammonia total [as N], 30-day average38.7 mg/L≤ 26 mg/L49%
May 2026005Sulfate, 30-day average1842.06 mg/L≤ 902 mg/L104%
May 2026005Uranium, total, 30-day average65 ug/L≤ 30 ug/L117%
June 2026004Nitrogen, ammonia total [as N], 30-day average43.2 mg/L≤ 11 mg/L293%
June 2026005Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum value6.5 tox chronic≥ 13 tox chronic50%
June 2026005Sulfate, 30-day average2016.01 mg/L≤ 902 mg/L124%
June 2026005Uranium, total, 30-day average48.5 ug/L≤ 30 ug/L62%
July 2026004Nitrogen, ammonia total [as N], 30-day average39.2 mg/L≤ 19 mg/L106%
July 2026005Sulfate, 30-day average2484.02 mg/L≤ 902 mg/L175%
July 2026005Uranium, total, 30-day average61.6 ug/L≤ 30 ug/L105%
August 2026004Nitrogen, ammonia total [as N], 30-day average37.3 mg/L≤ 12 mg/L211%
August 2026005Sulfate, 30-day average1942.6 mg/L≤ 902 mg/L115%
August 2026005Uranium, total, 30-day average54.5 ug/L≤ 30 ug/L82%

Limits in force (220)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6.5 SUall year003
pHmaximum≤ 9 SUall year003
Solids, total suspended30-day average≤ 30 mg/Lall year003
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year003
Nitrogen, inorganic totaldaily maximumreport only (mg/L)all year003
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year003
Chloride [as Cl]30-day averagereport only (mg/L)all year003
Arsenic, total recoverable30-day averagereport only (ug/L)all year003
Iron, total recoverable30-day averagereport only (ug/L)all year003
Iron, dissolved [as Fe]30-day averagereport only (ug/L)all year003
Manganese, dissolved [as Mn]30-day averagereport only (ug/L)all year003
Nickel, total recoverable30-day averagereport only (ug/L)all year003
Cadmium, total recoverabledaily maximumreport only (ug/L)all year003
Lead, total recoverabledaily maximumreport only (ug/L)all year003
Molybdenum, total recoverable30-day averagereport only (ug/L)all year003
Chromium, hexavalent dissolved [as Cr]30-day averagereport only (ug/L)all year003
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year003
Zinc, potentially dissolved30-day averagereport only (ug/L)all year003
Zinc, potentially dissolveddaily maximumreport only (ug/L)all year003
Silver, potentially dissolved30-day averagereport only (ug/L)all year003
Silver, potentially dissolveddaily maximumreport only (ug/L)all year003
Copper, potentially dissolved30-day averagereport only (ug/L)all year003
Copper, potentially dissolveddaily maximumreport only (ug/L)all year003
Arsenic, potentially dissolveddaily maximumreport only (ug/L)all year003
Cadmium, potentially dissolvd30-day averagereport only (ug/L)all year003
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all year003
Chromium, trivalent, potentially dissolvd30-day averagereport only (ug/L)all year003
Lead, potentially dissolvd30-day averagereport only (ug/L)all year003
Lead, potentially dissolvddaily maximumreport only (ug/L)all year003
Manganese, potentially dissolvd30-day averagereport only (ug/L)all year003
Manganese, potentially dissolvddaily maximumreport only (ug/L)all year003
Nickel, potentially dissolvd30-day averagereport only (ug/L)all year003
Nickel, potentially dissolvddaily maximumreport only (ug/L)all year003
Selenium, potentially dissolvd30-day averagereport only (ug/L)all year003
Selenium, potentially dissolvddaily maximumreport only (ug/L)all year003
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year003
Chromium, trivalent total recoverabledaily maximumreport only (ug/L)all year003
Radium 226 + radium 228, total30-day averagereport only (pCi/L)all year003
Uranium, total30-day averagereport only (ug/L)all year003
Flow, in conduit or thru treatment plant30-day average≤ .76 MGDall year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Chlorine, total residual30-day averagereport only (mg/L)all year003
Chlorine, total residualinstantaneous maximumreport only (mg/L)all year003
Mercury, total [low level]30-day averagereport only (mg/L)all year003
E. coli30-day geometric meanreport only (#/100mL)all year003
E. colimaximum 7-day geometric meanreport only (#/100mL)all year003
Sulfide-hydrogen sulfide [undissociated]30-day arithmetic meanreport only (mg/L)all year003
Nonylphenol30-day arithmetic meanreport only (ug/L)all year003
Nonylphenoldaily maximumreport only (ug/L)all year003
Sulfate30-day averagereport only (mg/L)all year003
Oil and grease visualinstantaneous maximumreport only (abst=0;prst=1)all year003
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year004
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (mg/L)all year004
pHminimum≥ 6.5 SUall year004
pHmaximum≤ 9 SUall year004
Solids, total suspended30-day average≤ 75 mg/Lall year004
Solids, total suspendedmaximum 7-day average≤ 110 mg/Lall year004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Jan004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Feb004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Mar004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Apr004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)May004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Jun004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Jul004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Aug004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Sep004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Oct004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Nov004
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)Dec004
Nitrogen, ammonia total [as N]30-day average≤ 55 mg/Lall year004
Nitrogen, ammonia total [as N]30-day average≤ 28 mg/LFeb004
Nitrogen, ammonia total [as N]30-day average≤ 21 mg/LMar004
Nitrogen, ammonia total [as N]30-day average≤ 18 mg/LApr004
Nitrogen, ammonia total [as N]30-day average≤ 26 mg/LMay004
Nitrogen, ammonia total [as N]30-day average≤ 11 mg/LJun004
Nitrogen, ammonia total [as N]30-day average≤ 19 mg/LJul004
Nitrogen, ammonia total [as N]30-day average≤ 12 mg/LAug004
Nitrogen, ammonia total [as N]30-day average≤ 43 mg/LSep004
Nitrogen, ammonia total [as N]30-day average≤ 24 mg/LOct004
Nitrogen, ammonia total [as N]30-day average≤ 20 mg/LNov004
Nitrogen, ammonia total [as N]30-day average≤ 28 mg/LDec004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJan004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LFeb004
Nitrogen, ammonia total [as N]daily maximum≤ 48 mg/LMar004
Nitrogen, ammonia total [as N]daily maximum≤ 51 mg/LApr004
Nitrogen, ammonia total [as N]daily maximum≤ 54 mg/LMay004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJun004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJul004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LAug004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LSep004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LOct004
Nitrogen, ammonia total [as N]daily maximum≤ 41 mg/LNov004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LDec004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/Lall year004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LFeb004
Nitrogen, ammonia total [as N]daily maximum≤ 48 mg/LMar004
Nitrogen, ammonia total [as N]daily maximum≤ 51 mg/LApr004
Nitrogen, ammonia total [as N]daily maximum≤ 54 mg/LMay004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJun004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LJul004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LAug004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LSep004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LOct004
Nitrogen, ammonia total [as N]daily maximum≤ 41 mg/LNov004
Nitrogen, ammonia total [as N]daily maximum≤ 65 mg/LDec004
Nitrogen, inorganic totaldaily maximumreport only (mg/L)all year004
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year004
Chloride [as Cl]30-day averagereport only (mg/L)all year004
Arsenic, total recoverable30-day averagereport only (ug/L)all year004
Iron, total recoverable30-day averagereport only (ug/L)all year004
Iron, dissolved [as Fe]30-day averagereport only (ug/L)all year004
Manganese, dissolved [as Mn]30-day averagereport only (ug/L)all year004
Nickel, total recoverable30-day averagereport only (ug/L)all year004
Cadmium, total recoverabledaily maximumreport only (ug/L)all year004
Lead, total recoverabledaily maximumreport only (ug/L)all year004
Molybdenum, total recoverable30-day averagereport only (ug/L)all year004
Chromium, hexavalent dissolved [as Cr]30-day averagereport only (ug/L)all year004
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year004
Zinc, potentially dissolved30-day averagereport only (ug/L)all year004
Zinc, potentially dissolveddaily maximumreport only (ug/L)all year004
Silver, potentially dissolved30-day arithmetic meanreport only (ug/L)all year004
Silver, potentially dissolveddaily maximumreport only (ug/L)all year004
Copper, potentially dissolved30-day averagereport only (ug/L)all year004
Copper, potentially dissolveddaily maximumreport only (ug/L)all year004
Arsenic, potentially dissolveddaily maximumreport only (ug/L)all year004
Cadmium, potentially dissolvd30-day averagereport only (ug/L)all year004
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all year004
Chromium, trivalent, potentially dissolvd30-day averagereport only (ug/L)all year004
Lead, potentially dissolvd30-day averagereport only (ug/L)all year004
Lead, potentially dissolvddaily maximumreport only (ug/L)all year004
Manganese, potentially dissolvd30-day averagereport only (ug/L)all year004
Manganese, potentially dissolvddaily maximumreport only (ug/L)all year004
Nickel, potentially dissolvd30-day averagereport only (ug/L)all year004
Nickel, potentially dissolvddaily maximumreport only (ug/L)all year004
Selenium, potentially dissolvd30-day averagereport only (ug/L)all year004
Selenium, potentially dissolvddaily maximumreport only (ug/L)all year004
Oil and greaseinstantaneous maximum≤ 10 mg/Lall year004
Chromium, trivalent total recoverabledaily maximumreport only (ug/L)all year004
Radium 226 + radium 228, total30-day averagereport only (pCi/L)all year004
Uranium, total30-day averagereport only (ug/L)all year004
Flow, in conduit or thru treatment plant30-day average≤ .5 MGDall year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Chlorine, total residual30-day averagereport only (mg/L)all year004
Chlorine, total residualdaily maximumreport only (mg/L)all year004
Mercury, total [low level]30-day averagereport only (mg/L)all year004
E. coli30-day geometric meanreport only (#/100mL)all year004
E. colimaximum 7-day geometric meanreport only (#/100mL)all year004
Sulfide-hydrogen sulfide [undissociated]30-day averagereport only (mg/L)all year004
Nonylphenol30-day averagereport only (ug/L)all year004
Nonylphenoldaily maximumreport only (ug/L)all year004
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year004
Sulfate30-day averagereport only (mg/L)all year004
Oil and grease visualinstantaneous maximumreport only (abst=0;prst=1)all year004
Nitrogen, inorganic totaldaily maximumreport only (mg/L)all year005
Cyanide, weak acid, dissociable30-day average≤ 5 ug/Lall year005
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year005
Chloride [as Cl]30-day averagereport only (mg/L)all year005
Arsenic, total recoverable30-day averagereport only (ug/L)all year005
Iron, total recoverable30-day averagereport only (ug/L)all year005
Iron, total recoverable30-day average≤ 1000 ug/Lall year005
Iron, dissolved [as Fe]30-day averagereport only (ug/L)all year005
Manganese, dissolved [as Mn]30-day averagereport only (ug/L)all year005
Nickel, total recoverable30-day averagereport only (ug/L)all year005
Cadmium, total recoverabledaily maximumreport only (ug/L)all year005
Lead, total recoverabledaily maximumreport only (ug/L)all year005
Molybdenum, total recoverable30-day averagereport only (ug/L)all year005
Chromium, hexavalent dissolved [as Cr]30-day averagereport only (ug/L)all year005
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year005
Silver, potentially dissolved30-day averagereport only (ug/L)all year005
Silver, potentially dissolveddaily maximumreport only (ug/L)all year005
Copper, potentially dissolved30-day averagereport only (ug/L)all year005
Copper, potentially dissolveddaily maximumreport only (ug/L)all year005
Arsenic, potentially dissolveddaily maximumreport only (ug/L)all year005
Cadmium, potentially dissolvd30-day averagereport only (ug/L)all year005
Cadmium, potentially dissolvddaily maximumreport only (ug/L)all year005
Chromium, trivalent, potentially dissolvd30-day averagereport only (ug/L)all year005
Lead, potentially dissolvd30-day averagereport only (ug/L)all year005
Lead, potentially dissolvddaily maximumreport only (ug/L)all year005
Manganese, potentially dissolvd30-day averagereport only (ug/L)all year005
Manganese, potentially dissolvddaily maximumreport only (ug/L)all year005
Nickel, potentially dissolvd30-day averagereport only (ug/L)all year005
Nickel, potentially dissolvddaily maximumreport only (ug/L)all year005
Selenium, potentially dissolvd30-day average≤ 28.4 ug/Lall year005
Selenium, potentially dissolvddaily maximumreport only (ug/L)all year005
Chromium, trivalent total recoverabledaily maximumreport only (ug/L)all year005
Radium 226 + radium 228, total30-day averagereport only (pCi/L)all year005
Uranium, total30-day averagereport only (ug/L)all year005
Uranium, total30-day average≤ 30 ug/Lall year005
Uranium, totaldaily maximumreport only (ug/L)all year005
Flow, in conduit or thru treatment plant30-day average≤ 1.26 MGDall year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
Chlorine, total residual30-day average≤ .086 mg/Lall year005
Chlorine, total residualdaily maximum≤ .12 mg/Lall year005
Mercury, total [low level]30-day averagereport only (mg/L)all year005
Mercury, total [low level]30-day average≤ .01 mg/Lall year005
E. coli30-day geometric mean≤ 222 #/100mLall year005
E. colimaximum 7-day geometric mean≤ 444 #/100mLall year005
Sulfide-hydrogen sulfide [undissociated]30-day averagereport only (mg/L)all year005
Nonylphenol30-day averagereport only (ug/L)all year005
Nonylphenoldaily maximumreport only (ug/L)all year005
Sulfate30-day averagereport only (mg/L)all year005
Sulfate30-day average≤ 902 mg/Lall year005
Static Renewal 7 Day Chronic Ceriodaphnia dubiasingle samplereport only (tox chronic)all year005
Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum valuereport only (tox chronic)all year005
Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum value≥ 13 tox chronicall year005
Static Renewal 7 Day Chronic Pimephales promelassingle samplereport only (tox chronic)all year005
Static Renewal 7 Day Chronic Pimephales promelasminimum valuereport only (tox chronic)all year005
Static Renewal 7 Day Chronic Pimephales promelasminimum value≥ 13 tox chronicall year005
Plant capacity fact. percent of capacity30-day averagereport only (%)all year300
Plant capacity fact. percent of capacity30-day averagereport only (%)all year300
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (mg/L)all year300
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year300
BOD, 5-day, 20 deg. Cmaximum 7-day averagereport only (lb/d)all year300
Solids, total suspended30-day averagereport only (mg/L)all year300
Solids, total suspendedmaximum 7-day averagereport only (mg/L)all year300
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year300
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year300
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year300
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year300

How strict are these limits?

Cited limits by parameter: Colorado's rules and the federal ones.

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