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Plants facing new discharge limits — by state and pollutant

for Mercury, total low level: 19 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between Nov 1, 2026 and Jan 1, 2030 (65 limits); 2 of them reported a median above that limit between Oct 1, 2025 and Sep 30, 2026. EPA's file of Oct 16, 2026.

By state: OH 19

By pollutant: all · Nitrogen, ammonia total [as N] 526 · Chlorine, total residual 272 · Phosphorus, total [as P] 106 · E. coli 103 · Copper, total [as Cu] 85 · Copper, total recoverable 63 · Solids, total suspended 60 · Chloride [as Cl] 56 · BOD, carbonaceous [5 day, 20 C] 48 · Zinc, total [as Zn] 39 · Zinc, total recoverable 36 · BOD, 5-day, 20 deg. C 35 · pH 31 · Cyanide, free available 30 · Nitrogen, total [as N] 28 · Iron, total [as Fe] 22 · Mercury, total [as Hg] 22 · Toxicity [acute], Ceriodaphnia dubia 22 · Toxicity [acute], Pimephales promelas [Fathead Minnow] 21 · Selenium, total [as Se] 20 · Di[2-ethylhexyl] phthalate [DEHP] 19 · E. coli, MTEC-MF 19 · Mercury, total low level 19 · Toxicity [chronic], Ceriodaphnia dubia 18 · Toxicity [chronic], Pimephales promelas [Fathead Minnow] 18

PlantPermitStateTypeDesign flowParameterNew limitEffectiveToday's median× limit
Village of Columbus Grove WWTPOH0024759OHSewage plant.82 MGDMercury, total low levelmonthly average 1.3 ng/L, tighterApr 1, 202726 ng/L (11 values)20×
Village of Columbus Grove WWTPOH0024759OHSewage plant.82 MGDMercury, total low levelmonthly average 0.000004 kg/d, tighterApr 1, 20270.000021 kg/d (11 values)5.25×
Hamler, Village ofOH0021105OHSewage plant.113 MGDMercury, total low levelmonthly average 1.3 ng/L, newJun 1, 20277.18 ng/L (4 values)5.52×
North Lewisburg, Village ofOH0023582OHSewage plant.42 MGDMercury, total low leveldaily maximum 1700 ng/L, newNov 1, 2026under 3 values—
North Lewisburg, Village ofOH0023582OHSewage plant.42 MGDMercury, total low leveldaily maximum 0.0027 kg/d, newNov 1, 2026under 3 values—
North Lewisburg, Village ofOH0023582OHSewage plant.42 MGDMercury, total low levelmonthly average 0.000019 kg/d, newNov 1, 2026under 3 values—
North Lewisburg, Village ofOH0023582OHSewage plant.42 MGDMercury, total low levelmonthly average 12 ng/L, newNov 1, 2026under 3 values—
City of WarrenOH0027987OHSewage plant, major16 MGDMercury, total low levelmonthly average 12 ng/L, newDec 1, 20266.55 ng/L (11 values)0.546×
City of WarrenOH0027987OHSewage plant, major16 MGDMercury, total low leveldaily maximum 1700 ng/L, newDec 1, 20269.04 ng/L (11 values)0.00532×
City of Lancaster WPC DeptOH0136603OHIndustrial, major4 MGDMercury, total low leveldaily maximum 0.026 kg/d, newDec 1, 2026under 3 values—
City of Lancaster WPC DeptOH0136603OHIndustrial, major4 MGDMercury, total low leveldaily maximum 1700 ng/L, newDec 1, 2026under 3 values—
City of Lancaster WPC DeptOH0136603OHIndustrial, major4 MGDMercury, total low levelmonthly average 0.00018 kg/d, newDec 1, 2026under 3 values—
City of Lancaster WPC DeptOH0136603OHIndustrial, major4 MGDMercury, total low levelmonthly average 12 ng/L, newDec 1, 2026under 3 values—
City of WarrenOH0027987OHSewage plant, major16 MGDMercury, total low leveldaily maximum 0.1 kg/d, newDec 1, 2026under 3 values—
City of WarrenOH0027987OHSewage plant, major16 MGDMercury, total low levelmonthly average 0.00073 kg/d, newDec 1, 2026under 3 values—
Erie Co Dept of Environmental ServicesOH0053082OHSewage plant, major2.4 MGDMercury, total low levelmonthly average 1.9 ng/L, tighterJan 1, 20271.1 ng/L (11 values)0.579×
Wheelersburg WWTP SD No 2OH0050016OHSewage plant, major1.2 MGDMercury, total low levelmonthly average 12 ng/L, newFeb 1, 20275.6 ng/L (11 values)0.467×
Wheelersburg WWTP SD No 2OH0050016OHSewage plant, major1.2 MGDMercury, total low leveldaily maximum 1700 ng/L, newFeb 1, 20275.6 ng/L (11 values)0.00329×
Wheelersburg WWTP SD No 2OH0050016OHSewage plant, major1.2 MGDMercury, total low leveldaily maximum 0.0077 kg/d, newFeb 1, 2027under 3 values—
Wheelersburg WWTP SD No 2OH0050016OHSewage plant, major1.2 MGDMercury, total low levelmonthly average 0.000055 kg/d, newFeb 1, 2027under 3 values—
City of CrestlineOH0020664OHSewage plant, major.95 MGDMercury, total low leveldaily maximum 0.00611 kg/d, tighterMar 1, 20270.0000043 kg/d (10 values)0.000704×
Jackson Center, Village ofOH0025861OHSewage plant.37 MGDMercury, total low levelmonthly average 12 ng/L, newApr 1, 20271.5 ng/L (4 values)0.125×
Jackson Center, Village ofOH0025861OHSewage plant.37 MGDMercury, total low leveldaily maximum 1700 ng/L, newApr 1, 20271.5 ng/L (4 values)0.000882×
Jackson Center, Village ofOH0025861OHSewage plant.37 MGDMercury, total low leveldaily maximum 0.0024 kg/d, newApr 1, 2027under 3 values—
Jackson Center, Village ofOH0025861OHSewage plant.37 MGDMercury, total low levelmonthly average 0.000017 kg/d, newApr 1, 2027under 3 values—
Eaton Homes WWTPOH0026140OHSewage plant.2 MGDMercury, total low leveldaily maximum 0.00129 kg/d (Jun, Dec), newMay 1, 2027under 3 values—
Eaton Homes WWTPOH0026140OHSewage plant.2 MGDMercury, total low leveldaily maximum 1700 ng/L (Jun, Dec), newMay 1, 2027under 3 values—
Eaton Homes WWTPOH0026140OHSewage plant.2 MGDMercury, total low levelmonthly average 0.000001 kg/d (Jun, Dec), newMay 1, 2027under 3 values—
Eaton Homes WWTPOH0026140OHSewage plant.2 MGDMercury, total low levelmonthly average 1.3 ng/L (Jun, Dec), newMay 1, 2027under 3 values—
Hamler, Village ofOH0021105OHSewage plant.113 MGDMercury, total low leveldaily maximum 1700 ng/L, newJun 1, 20277.18 ng/L (4 values)0.00422×
Hamler, Village ofOH0021105OHSewage plant.113 MGDMercury, total low leveldaily maximum 0.00073 kg/d, newJun 1, 2027under 3 values—
Hamler, Village ofOH0021105OHSewage plant.113 MGDMercury, total low levelmonthly average 5.6e-7 kg/d, newJun 1, 2027under 3 values—
City of Johnstown WWTPOH0020508OHSewage plant1.2 MGDMercury, total low levelmonthly average 12 ng/L, newSep 1, 20276.45 ng/L (10 values)0.538×
City of Johnstown WWTPOH0020508OHSewage plant1.2 MGDMercury, total low leveldaily maximum 1700 ng/L, newSep 1, 20276.45 ng/L (10 values)0.00379×
City of Johnstown WWTPOH0020508OHSewage plant1.2 MGDMercury, total low leveldaily maximum 0.015 kg/d, newSep 1, 2027under 3 values—
City of Johnstown WWTPOH0020508OHSewage plant1.2 MGDMercury, total low levelmonthly average 0.00011 kg/d, newSep 1, 2027under 3 values—
Parkman Wastewater Treatment PlantOH0134279OHIndustrial.149 MGDMercury, total low leveldaily maximum 1700 ng/L (Jun, Dec), newNov 1, 2027under 3 values—
Parkman Wastewater Treatment PlantOH0134279OHIndustrial.149 MGDMercury, total low leveldaily maximum 0.001 kg/d (Jun, Dec), newNov 1, 2027under 3 values—
Parkman Wastewater Treatment PlantOH0134279OHIndustrial.149 MGDMercury, total low levelmonthly average 7e-7 kg/d (Jun, Dec), newNov 1, 2027under 3 values—
Parkman Wastewater Treatment PlantOH0134279OHIndustrial.149 MGDMercury, total low levelmonthly average 1.3 ng/L (Jun, Dec), newNov 1, 2027under 3 values—
Brentwood Lake WWTPOH0026158OHSewage plant.12 MGDMercury, total low leveldaily maximum 1700 ng/L (Jun, Dec), newJan 1, 2028under 3 values—
Brentwood Lake WWTPOH0026158OHSewage plant.12 MGDMercury, total low leveldaily maximum 0.00077 kg/d (Jun, Dec), newJan 1, 2028under 3 values—
Brentwood Lake WWTPOH0026158OHSewage plant.12 MGDMercury, total low levelmonthly average 5.9e-7 kg/d (Jun, Dec), newJan 1, 2028under 3 values—
Brentwood Lake WWTPOH0026158OHSewage plant.12 MGDMercury, total low levelmonthly average 1.3 ng/L (Jun, Dec), newJan 1, 2028under 3 values—
Miami Trails WWTPOH0096504OHSewage plant.4 MGDMercury, total low leveldaily maximum 1700 ng/L (Mar, Jun, Aug, Dec), newMay 1, 2028under 3 values—
Miami Trails WWTPOH0096504OHSewage plant.4 MGDMercury, total low leveldaily maximum 0.0026 kg/d (Mar, Jun, Aug, Dec), newMay 1, 2028under 3 values—
Miami Trails WWTPOH0096504OHSewage plant.4 MGDMercury, total low levelmonthly average 12 ng/L (Mar, Jun, Aug, Dec), newMay 1, 2028under 3 values—
Miami Trails WWTPOH0096504OHSewage plant.4 MGDMercury, total low levelmonthly average 0.000018 kg/d (Mar, Jun, Aug, Dec), newMay 1, 2028under 3 values—
General Motors LLC - DefianceOH0002666OHIndustrial, major—Mercury, total low levelmonthly average 1.3 ng/L, newJun 1, 20280.81 ng/L (8 values)0.623×
City of Bedford Heights Water Reclamation PlantOH0024058OHSewage plant, major3.6 MGDMercury, total low levelmonthly average 1.3 ng/L, tighterJun 1, 20280.77 ng/L (6 values)0.592×
City of Bedford Heights Water Reclamation PlantOH0024058OHSewage plant, major3.6 MGDMercury, total low levelmonthly average 0.000018 kg/d, tighterJun 1, 20280.0000043 kg/d (6 values)0.239×
General Motors LLC - DefianceOH0002666OHIndustrial, major—Mercury, total low leveldaily maximum 1700 ng/L, newJun 1, 20280.81 ng/L (8 values)0.000476×
General Motors LLC - DefianceOH0002666OHIndustrial, major—Mercury, total low leveldaily maximum 0.008 kg/d, newJun 1, 2028under 3 values—
General Motors LLC - DefianceOH0002666OHIndustrial, major—Mercury, total low levelmonthly average 0.000006 kg/d, newJun 1, 2028under 3 values—
Zimmer Power Company LLCOH0048836OHIndustrial, major—Mercury, total low levelmonthly average 12 ng/L, newDec 1, 20282.3 ng/L (9 values)0.192×
Zimmer Power Company LLCOH0048836OHIndustrial, major—Mercury, total low leveldaily maximum 1700 ng/L, newDec 1, 20282.3 ng/L (9 values)0.00135×
Zimmer Power Company LLCOH0048836OHIndustrial, major—Mercury, total low leveldaily maximum 0.00095 kg/d, newDec 1, 2028under 3 values—
Zimmer Power Company LLCOH0048836OHIndustrial, major—Mercury, total low levelmonthly average 0.0000067 kg/d, newDec 1, 2028under 3 values—
Zimmer Power Company LLCOH0048836OHIndustrial, major—Mercury, total low leveldaily maximum 1700 ng/L, newDec 1, 2028under 3 values—
Zimmer Power Company LLCOH0048836OHIndustrial, major—Mercury, total low leveldaily maximum 0.00014 kg/d, newDec 1, 2028under 3 values—
Zimmer Power Company LLCOH0048836OHIndustrial, major—Mercury, total low levelmonthly average 0.000001 kg/d, newDec 1, 2028under 3 values—
Zimmer Power Company LLCOH0048836OHIndustrial, major—Mercury, total low levelmonthly average 12 ng/L, newDec 1, 2028under 3 values—
Cleveland-Cliffs Cleveland Works LLCOH0000957OHIndustrial, major—Mercury, total low leveldaily maximum 1700 ng/L (Mar, Jun, Sep, Dec), newMar 1, 2029under 3 values—
Cleveland-Cliffs Cleveland Works LLCOH0000957OHIndustrial, major—Mercury, total low levelmonthly average 1.3 ng/L (Mar, Jun, Sep, Dec), newMar 1, 2029under 3 values—
Cardinal Operating Company - Cardinal PlantOH0012581OHIndustrial, major—Mercury, total low leveldaily maximum 788 ng/L, tighterJan 1, 20302.06 ng/L (7 values)0.00261×

Each limit is one EPA's ICIS-NPDES file holds on the permit's current version with a begin date after today, enforceable and numeric, either on a parameter the outfall was never limited on (new) or lower than the limit in force (tighter). Today's median is the plant's own reported values for the same outfall, statistic and unit between Oct 1, 2025 and Sep 30, 2026, with how many; none is shown where most were below a detection limit. Read the permit before relying on a value.

Sell to these plants? The list for your states every week, with every plant over a limit on your pollutant, as a spreadsheet, by API and by email when a new one appears: ask for the plant list, or write to info@passage-data.com. What a seller gets.

For programs and AI agents: a state's permits with these limits as JSON at /api/v1/permits?state=OH&upcoming=true, narrowed with &facility_type=potw or &min_flow_mgd=1; the whole list at /dmr/data/upcoming.json; or add https://passage-data.com/mcp as a remote MCP server (tool list_permits). Free, no key. llms.txt

From EPA's ECHO data, not the permit document itself: your permit is the final word. All states