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Rayville, Town of

Sewage treatment plant, major discharger, Rayville, Louisiana. NPDES permit LA0020559, in force until May 31, 2028. Last 12 months: over a limit 43 times (last September 2026), 13 of 38 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (16 values), form CE monthly (11 values), form PI monthly (11 values), form Q quarterly (8 values)
Renewal application due
Dec 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
25 values over a limit, 0 required values missing, 6 of 40 reports late

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

All 43 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], monthly average5.88 mg/L≤ 5 mg/L18%
October 2025BOD, carbonaceous [5 day, 20 C], monthly average81.3 lb/d≤ 62 lb/d31%
November 2025Solids, total suspended, monthly average16.49 mg/L≤ 15 mg/L10%
November 2025Solids, total suspended, weekly average36.09 mg/L≤ 23 mg/L57%
December 2025Solids, total suspended, monthly average26.86 mg/L≤ 15 mg/L79%
December 2025Solids, total suspended, monthly average317.17 lb/d≤ 187 lb/d70%
December 2025Solids, total suspended, weekly average37.51 mg/L≤ 23 mg/L63%
January 2026Solids, total suspended, monthly average21.45 mg/L≤ 15 mg/L43%
January 2026Solids, total suspended, monthly average291.16 lb/d≤ 187 lb/d56%
January 2026Solids, total suspended, weekly average54.3 mg/L≤ 23 mg/L136%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average12.64 mg/L≤ 10 mg/L26%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average170.62 lb/d≤ 125 lb/d36%
February 2026BOD, carbonaceous [5 day, 20 C], weekly average16.29 mg/L≤ 15 mg/L9%
February 2026Solids, total suspended, monthly average22.11 mg/L≤ 15 mg/L47%
February 2026Solids, total suspended, monthly average298.43 lb/d≤ 187 lb/d60%
February 2026Solids, total suspended, weekly average31.22 mg/L≤ 23 mg/L36%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average10.19 mg/L≤ 10 mg/L2%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average173.42 lb/d≤ 125 lb/d39%
March 2026Solids, total suspended, monthly average34.53 mg/L≤ 15 mg/L130%
March 2026Solids, total suspended, monthly average587.83 lb/d≤ 187 lb/d214%
March 2026Solids, total suspended, weekly average37.55 mg/L≤ 23 mg/L63%
April 2026Solids, total suspended, monthly average352.17 lb/d≤ 187 lb/d88%
April 2026Solids, total suspended, monthly average45.79 mg/L≤ 15 mg/L205%
April 2026Solids, total suspended, weekly average52.03 mg/L≤ 23 mg/L126%
April 2026Whole Effluent Toxicity [WET] - C. dubia, 7-day minimum30 %≥ 96 %69%
April 2026Whole Effluent Toxicity [WET] - C. dubia, monthly average minimum30 %≥ 96 %69%
April 2026Whole Effluent Toxicity [WET] - P. promelas, 7-day minimum72 %≥ 96 %25%
April 2026Whole Effluent Toxicity [WET] - P. promelas, monthly average minimum72 %≥ 96 %25%
April 2026pH, instantaneous maximum8.7 SU≤ 8.5 SU—
May 2026BOD, carbonaceous [5 day, 20 C], monthly average6.99 mg/L≤ 5 mg/L40%
May 2026BOD, carbonaceous [5 day, 20 C], weekly average8.66 mg/L≤ 8 mg/L8%
May 2026Solids, total suspended, monthly average428.3 lb/d≤ 187 lb/d129%
May 2026Solids, total suspended, monthly average49.86 mg/L≤ 15 mg/L232%
May 2026Solids, total suspended, weekly average56.2 mg/L≤ 23 mg/L144%
May 2026pH, instantaneous maximum9.5 SU≤ 8.5 SU—
June 2026Solids, total suspended, monthly average16.57 mg/L≤ 15 mg/L10%
June 2026Solids, total suspended, monthly average244.15 lb/d≤ 187 lb/d31%
June 2026Solids, total suspended, weekly average34.14 mg/L≤ 23 mg/L48%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average5.73 mg/L≤ 5 mg/L15%
July 2026BOD, carbonaceous [5 day, 20 C], weekly average9.02 mg/L≤ 8 mg/L13%
August 2026Nitrogen, ammonia total [as N], monthly average6.82 mg/L≤ 5 mg/L36%
September 2026BOD, carbonaceous [5 day, 20 C], monthly average6.9 mg/L≤ 5 mg/L38%
September 2026BOD, carbonaceous [5 day, 20 C], weekly average9.29 mg/L≤ 8 mg/L16%

Limits in force (49)

ParameterStatisticLimitMonths
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 187 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 62 lb/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualdaily maximum< .033 mg/Lall year
Whole Effluent Toxicity [WET] - C. dubia7-day minimum≥ 96 %all year
Whole Effluent Toxicity [WET] - C. dubiamonthly average minimum≥ 96 %all year
Whole Effluent Toxicity [WET] - P. promelas7-day minimum≥ 96 %all year
Whole Effluent Toxicity [WET] - P. promelasmonthly average minimum≥ 96 %all year
Mercury, total [as Hg]monthly average≤ .00034 lb/dall year
Mercury, total [as Hg]daily maximum≤ .00081 lb/dall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 8 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 125 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 62 lb/dMay–Oct
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubiamaximumreport only (%)all year
Coef Of Var Static Renewal 7Day Chronic Pimephales promelasmaximumreport only (%)all year

New limits from Jun 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average16.5 lb/dtighter19.75 lb/d (12 values)1.2×
Nitrogen, ammonia total [as N], monthly average2 mg/Ltighter1.695 mg/L (12 values)0.848×
Nitrogen, ammonia total [as N], weekly average4.7 mg/Ltighter3.225 mg/L (12 values)0.686×

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

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