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Tri Cities North Regional WW Authority

Sewage treatment plant, major discharger, Dayton, Ohio. NPDES permit OH0049646, in force until Feb 28, 2027. Last 12 months: over a limit 40 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (39 values), outfall 300 form A monthly (2 values), outfall 581 form A monthly (21 values), outfall 601 form A monthly (6 values), outfall 801 form A monthly (8 values), outfall 901 form A monthly (14 values)
Renewal application due
Sep 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 0 of 65 reports late

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

All 40 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], monthly average2.13≤ 1.5 mg/L42%
October 2025Nitrogen, ammonia total [as N], monthly average68.1≤ 63.6 kg/d7%
October 2025Nitrogen, ammonia total [as N], weekly maximum147≤ 96 kg/d53%
October 2025Nitrogen, ammonia total [as N], weekly maximum4.86≤ 2.3 mg/L111%
October 2025Oxygen, dissolved [DO], daily minimum5.8≥ 6 mg/L3%
November 2025Oxygen, dissolved [DO], daily minimum5.3≥ 6 mg/L12%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average13≤ 12 mg/L8%
January 2026BOD, carbonaceous [5 day, 20 C], weekly maximum24≤ 18 mg/L33%
January 2026Nitrogen, ammonia total [as N], monthly average119.5≤ 106 kg/d13%
January 2026Nitrogen, ammonia total [as N], monthly average3.724≤ 2.5 mg/L49%
January 2026Nitrogen, ammonia total [as N], weekly maximum291≤ 159 kg/d83%
January 2026Nitrogen, ammonia total [as N], weekly maximum9.573≤ 3.8 mg/L152%
February 2026Nitrogen, ammonia total [as N], monthly average194≤ 106 kg/d83%
February 2026Nitrogen, ammonia total [as N], monthly average5.26≤ 2.5 mg/L110%
February 2026Nitrogen, ammonia total [as N], weekly maximum276≤ 159 kg/d74%
February 2026Nitrogen, ammonia total [as N], weekly maximum8.72≤ 3.8 mg/L129%
March 2026BOD, carbonaceous [5 day, 20 C], weekly maximum790≤ 763 kg/d4%
March 2026Solids, total suspended, monthly average910≤ 763 kg/d19%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average13≤ 12 mg/L8%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average510≤ 509 kg/d0%
April 2026Solids, total suspended, monthly average1000≤ 763 kg/d31%
April 2026Solids, total suspended, monthly average26≤ 18 mg/L44%
April 2026Solids, total suspended, weekly maximum1600≤ 1146 kg/d40%
April 2026Solids, total suspended, weekly maximum38≤ 27 mg/L41%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average13≤ 12 mg/L8%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average760≤ 509 kg/d49%
May 2026BOD, carbonaceous [5 day, 20 C], weekly maximum1100≤ 763 kg/d44%
May 2026BOD, carbonaceous [5 day, 20 C], weekly maximum20≤ 18 mg/L11%
May 2026Nitrogen, ammonia total [as N], monthly average99.8≤ 63.6 kg/d57%
May 2026Nitrogen, ammonia total [as N], weekly maximum219≤ 96 kg/d128%
May 2026Solids, total suspended, monthly average2200≤ 763 kg/d188%
May 2026Solids, total suspended, monthly average38≤ 18 mg/L111%
May 2026Solids, total suspended, weekly maximum2700≤ 1146 kg/d136%
May 2026Solids, total suspended, weekly maximum44≤ 27 mg/L63%
June 2026Solids, total suspended, monthly average20≤ 18 mg/L11%
June 2026Solids, total suspended, monthly average840≤ 763 kg/d10%
June 2026Solids, total suspended, weekly maximum1500≤ 1146 kg/d31%
June 2026Solids, total suspended, weekly maximum29≤ 27 mg/L7%
August 2026E. coli, MTEC-MF, monthly geometric mean137≤ 126 MPN/100mL9%
August 2026Nitrogen, ammonia total [as N], weekly maximum102≤ 96 kg/d6%

Limits in force (150)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year001
Solids, total suspendedmonthly average≤ 18 mg/Lall year001
Solids, total suspendedweekly maximum≤ 27 mg/Lall year001
Solids, total suspendedmonthly average≤ 763 kg/dall year001
Solids, total suspendedweekly maximum≤ 1146 kg/dall year001
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 2.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ 2.3 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly maximum≤ 3.8 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 63.6 kg/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 106 kg/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly maximum≤ 96 kg/dMay–Oct001
Nitrogen, ammonia total [as N]weekly maximum≤ 159 kg/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphate, ortho, dissolved [as P]monthly averagereport only (mg/L)all year001
Phosphate, ortho, dissolved [as P]daily maximumreport only (mg/L)all year001
Nickel, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec001
Nickel, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec001
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec001
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec001
Cadmium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec001
Cadmium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec001
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec001
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec001
Chromium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec001
Chromium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec001
Copper, total recoverablemonthly averagereport only (ug/L)all year001
Copper, total recoverabledaily maximumreport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)Mar, Jun, Aug, Dec001
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)Mar, Jun, Aug, Dec001
E. coli, MTEC-MFmonthly geometric mean≤ 126 MPN/100mLMay–Oct001
E. coli, MTEC-MFweekly geometric mean≤ 284 MPN/100mLMay–Oct001
Indeno[1,2,3-cd]pyrenemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec001
Indeno[1,2,3-cd]pyrenedaily maximumreport only (ug/L)Mar, Jun, Aug, Dec001
Di[2-ethylhexyl] phthalate [DEHP]monthly averagereport only (ug/L)all year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .037 mg/LMay–Oct001
Mercury, total low levelmonthly averagereport only (ng/L)all year001
Mercury, total low leveldaily maximumreport only (ng/L)all year001
Cyanide, free availablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec001
Cyanide, free availabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec001
Toxicity [acute], Ceriodaphnia dubiamonthly averagereport only (tox acute)Jun001
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (tox acute)Jun001
Toxicity [chronic], Ceriodaphnia dubiamonthly averagereport only (tox chronic)Jun001
Toxicity [chronic], Ceriodaphnia dubiadaily maximumreport only (tox chronic)Jun001
Toxicity [acute], Pimephales promelas [Fathead Minnow]monthly averagereport only (tox acute)Jun001
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox acute)Jun001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]monthly averagereport only (tox chronic)Jun001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox chronic)Jun001
pH, maximumdaily maximum≤ 9 SUall year001
pH, minimumdaily minimum≥ 6.5 SUall year001
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year001
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 12 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ 18 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 509 kg/dall year001
BOD, carbonaceous [5 day, 20 C]weekly maximum≤ 763 kg/dall year001
Overflowsmonthly averagereport only (occur/mo)all year300
Overflowsdaily maximumreport only (occur/mo)all year300
Nitrogen, ammonia in bottom depositsmonthly averagereport only (mg/kg)Mar, Jun, Sep, Dec581
Nitrogen, ammonia in bottom depositsdaily maximumreport only (mg/kg)Mar, Jun, Sep, Dec581
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/kg)Mar, Jun, Sep, Dec581
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/kg)Mar, Jun, Sep, Dec581
Phosphorous, total, in bottom depositsmonthly averagereport only (mg/kg)Mar, Jun, Sep, Dec581
Phosphorous, total, in bottom depositsdaily maximumreport only (mg/kg)Mar, Jun, Sep, Dec581
Potassium, in bottom depositsmonthly averagereport only (mg/kg)Mar, Jun, Sep, Dec581
Potassium, in bottom depositsdaily maximumreport only (mg/kg)Mar, Jun, Sep, Dec581
Arsenic, dry weightdaily maximum≤ 75 mg/kgMar, Jun, Sep, Dec581
Cadmium, in bottom deposits [dry wgt]daily maximum≤ 85 mg/kgMar, Jun, Sep, Dec581
Copper in bottom deposits [dry wgt]daily maximum≤ 4300 mg/kgMar, Jun, Sep, Dec581
Lead, total dry weight [as Pb]daily maximum≤ 840 mg/kgMar, Jun, Sep, Dec581
Nickel, tot in bottom deposits [dry wgt]daily maximum≤ 420 mg/kgMar, Jun, Sep, Dec581
Zinc in bottom deposits [dry wgt]daily maximum≤ 7500 mg/kgMar, Jun, Sep, Dec581
Selenium, dry weightdaily maximum≤ 100 mg/kgMar, Jun, Sep, Dec581
Biosolids weight indluding admixturesmonthly averagereport only (dry ton)Mar, Jun, Sep, Dec581
Biosolids weight indluding admixturesdaily maximumreport only (dry ton)Mar, Jun, Sep, Dec581
Sludge weight, drymonthly averagereport only (dry ton)Mar, Jun, Sep, Dec581
Sludge weight, drydaily maximumreport only (dry ton)Mar, Jun, Sep, Dec581
Mercury, tot in bot deposits [dry wgt]daily maximum≤ 57 mg/kgMar, Jun, Sep, Dec581
Molybdenum, sludge, total, dry weight [as Mo]daily maximum≤ 75 mg/kgMar, Jun, Sep, Dec581
Biosolids weight indluding admixturesmonthly averagereport only (dry ton)Dec586
Biosolids weight indluding admixturesdaily maximumreport only (dry ton)Dec586
Solids, total suspendedmonthly averagereport only (mg/L)all year601
Solids, total suspendeddaily maximumreport only (mg/L)all year601
Cyanide, total [as CN]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec601
Cyanide, total [as CN]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec601
Nickel, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec601
Nickel, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec601
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec601
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec601
Cadmium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec601
Cadmium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec601
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec601
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec601
Chromium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec601
Chromium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec601
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec601
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec601
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)Mar, Jun, Aug, Dec601
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)Mar, Jun, Aug, Dec601
Mercury, total low levelmonthly averagereport only (ng/L)Mar, Jun, Aug, Dec601
Mercury, total low leveldaily maximumreport only (ng/L)Mar, Jun, Aug, Dec601
pH, maximumdaily maximumreport only (SU)all year601
pH, minimumdaily minimumreport only (SU)all year601
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year601
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year601
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year801
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year801
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year801
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year801
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year801
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year801
Phosphorus, total [as P]monthly averagereport only (mg/L)all year801
Phosphorus, total [as P]daily maximumreport only (mg/L)all year801
E. coli, MTEC-MFmonthly geometric meanreport only (MPN/100mL)Jun–Aug801
E. coli, MTEC-MFdaily maximumreport only (MPN/100mL)Jun–Aug801
%Effect Static Renewal 48Hr Acute Ceriodaphnia dubiamonthly averagereport only (%)Jun801
%Effect Static Renewal 48Hr Acute Ceriodaphnia dubiadaily maximumreport only (%)Jun801
%Effect Static Renewal 96Hr Acute Pimephales promelasmonthly averagereport only (%)Jun801
%Effect Static Renewal 96Hr Acute Pimephales promelasdaily maximumreport only (%)Jun801
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly averagereport only (%)Jun801
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximumreport only (%)Jun801
%Effect Static Renewal 7Day Chronic Pimephales promelasmonthly averagereport only (%)Jun801
%Effect Static Renewal 7Day Chronic Pimephales promelasdaily maximumreport only (%)Jun801
Temperature, water deg. centigrademonthly averagereport only (deg C)all year901
Temperature, water deg. centigradedaily maximumreport only (deg C)all year901
pHdaily minimumreport only (SU)all year901
pHdaily maximumreport only (SU)all year901
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year901
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year901
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year901
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year901
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year901
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year901
Phosphorus, total [as P]monthly averagereport only (mg/L)all year901
Phosphorus, total [as P]daily maximumreport only (mg/L)all year901
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year901
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year901
E. coli, MTEC-MFmonthly geometric meanreport only (MPN/100mL)Jun–Aug901
E. coli, MTEC-MFdaily maximumreport only (MPN/100mL)Jun–Aug901

How strict are these limits?

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

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