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City of Ruston- Northside Wastewater Treatment Plant

Sewage treatment plant, major discharger, Ruston, Louisiana. NPDES permit LA0036323, in force until Jun 30, 2028. Last 12 months: over a limit 9 times (last June 2026), 20 of 41 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (13 values), outfall 001 form CE quarterly (21 values), outfall 001 form PI monthly (9 values), outfall 001 form Q quarterly (20 values), outfall 01A form A monthly (3 values)
Renewal application due
Jan 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
18 values over a limit, 0 required values missing, 7 of 44 reports late

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

Period endingParameterReportedLimitOver by
December 2025Solids, total dissolved, monthly average12600 mg/L≤ 177 mg/L7019%
December 2025Solids, total dissolved, monthly average307214 lb/d≤ 8868 lb/d3364%
December 2025Solids, total dissolved, weekly average12600 mg/L≤ 421 mg/L2893%
December 2025Sulfate, total [as SO4], monthly average21.3 mg/L≤ 11 mg/L94%
March 2026Solids, total dissolved, monthly average264 mg/L≤ 177 mg/L49%
March 2026Sulfate, total [as SO4], monthly average28.75 mg/L≤ 11 mg/L161%
March 2026Sulfate, total [as SO4], monthly average853.52 lb/d≤ 554 lb/d54%
March 2026Sulfate, total [as SO4], weekly average28.75 mg/L≤ 26 mg/L11%
June 2026Sulfate, total [as SO4], monthly average17 mg/L≤ 11 mg/L55%

Limits in force (66)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendedweekly average≤ 23 mg/Lall year001
Solids, total suspendedmonthly average≤ 751 lb/dall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]weekly averagereport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]weekly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Sulfate, total [as SO4]monthly average≤ 11 mg/Lall year001
Sulfate, total [as SO4]weekly average≤ 26 mg/Lall year001
Sulfate, total [as SO4]monthly average≤ 554 lb/dall year001
Copper, total [as Cu]monthly averagereport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]monthly average≤ .51 lb/dall year001
Copper, total [as Cu]daily maximum≤ 1.21 lb/dall year001
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all year001
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #17-day minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #1monthly average minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #27-day minimumreport only (pass=0;fail=1)all year001
WET, sublethal retest #2monthly average minimumreport only (pass=0;fail=1)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year001
Whole Effluent Toxicity - Retest #37-day minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity - Retest #3monthly average minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity, Sub-Lethal Retest #37-day minimumreport only (pass=0;fail=1)all year001
Whole Effluent Toxicity, Sub-Lethal Retest #3monthly average minimumreport only (pass=0;fail=1)all year001
Solids, total dissolvedmonthly average≤ 177 mg/Lall year001
Solids, total dissolvedweekly average≤ 421 mg/Lall year001
Solids, total dissolvedmonthly average≤ 8868 lb/dall year001
Mercury, total [as Hg]monthly averagereport only (mg/L)all year001
Mercury, total [as Hg]daily maximumreport only (mg/L)all year001
Mercury, total [as Hg]monthly average≤ .001 lb/dall year001
Mercury, total [as Hg]daily maximum≤ .003 lb/dall year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 500 lb/dall year001
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all year001
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all year001
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubiamaximumreport only (%)all year001
Coef Of Var Static Renewal 7Day Chronic Pimephales promelasmaximumreport only (%)all year001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/Lall year01A
Nitrogen, ammonia total [as N]weekly average≤ 8 mg/Lall year01A
Nitrogen, ammonia total [as N]monthly average≤ 200 lb/dall year01A

New limits from Jul 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average1.7 mg/Ltighter0.111 mg/L (12 values)0.0653×
Nitrogen, ammonia total [as N], monthly average85 lb/dtighter2.715 lb/d (12 values)0.0319×
Nitrogen, ammonia total [as N], weekly average4 mg/Ltighter0.25 mg/L (12 values)0.0625×

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

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