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Plants facing new discharge limits — by state and pollutant

In South Carolina, for Nitrogen, ammonia total [as N]: 8 plants hold a permit with a new or tighter discharge limit already written into it, taking effect between May 1, 2027 and Jan 1, 2031 (26 limits); 0 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: all · IA 90 · LA 80 · MS 63 · MD 45 · PA 45 · OH 40 · MI 33 · VA 33 · GA 22 · SC 8 · NE 7 · NY 7 · TX 7 · IN 6 · KS 6 · MO 5 · UT 5 · OR 4 · SD 4 · TN 4 · IL 3 · AR 2 · MN 2 · NJ 2 · NM 2 · CO 1

By pollutant: all · Chlorine, total residual 8 · Nitrogen, ammonia total [as N] 8 · BOD, 5-day, 20 deg. C 7 · Copper, total [as Cu] 5 · Lead, total [as Pb] 3 · Oxygen demand, ultimate 3 · Phosphorus, total [as P] 3 · Zinc, total [as Zn] 3 · %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia 2 · Cadmium, total [as Cd] 2 · E. coli 2 · Mercury, total [as Hg] 2 · Solids, total suspended 2 · Bis[chloromethyl] ether 1 · BOD, carbonaceous [5 day, 20 C] 1 · Chromium, hexavalent [as Cr] 1 · Flow, in conduit or thru treatment plant 1 · Length of longest pH excursion 1 · Nitrogen, total [as N] 1 · Peracetic Acid 1 · pH 1 · pH range excursions, monthly total accum 1 · Polychlorinated biphenyls [PCBs] 1 · Selenium, total [as Se] 1 · Temp. diff. between up/down stream deg. F 1

PlantPermitStateTypeDesign flowParameterNew limitEffectiveToday's median× limit
CITY OF HARTSVILLESC0021580SCSewage plant, major3.5 MGDNitrogen, ammonia total [as N]weekly average 11 mg/L (Mar–Oct), tighterMay 1, 20270.19 mg/L (7 values)0.0173×
CITY OF HARTSVILLESC0021580SCSewage plant, major3.5 MGDNitrogen, ammonia total [as N]monthly average 7 mg/L (Mar–Oct), tighterMay 1, 20270.18 mg/L (7 values, 4 below detection)—
NUCOR STEEL BERKELEYSC0047392SCIndustrial, major—Nitrogen, ammonia total [as N]daily maximum 7.56 mg/L (Mar–Oct), newJul 1, 20270 mg/L (7 values)0×
NUCOR STEEL BERKELEYSC0047392SCIndustrial, major—Nitrogen, ammonia total [as N]monthly average 1.13 mg/L (Mar–Oct), newJul 1, 20270 mg/L (7 values)0×
JACABB UTILITIES LLCSC0000591SCIndustrial.25 MGDNitrogen, ammonia total [as N]monthly average 2 mg/L, tighterMay 1, 20280.11 mg/L (11 values, 9 below detection)—
JACABB UTILITIES LLCSC0000591SCIndustrial.25 MGDNitrogen, ammonia total [as N]weekly average 3 mg/L, tighterMay 1, 20280.11 mg/L (11 values, 7 below detection)—
KERSHAW COUNTYSC0039870SCSewage plant, major2 MGDNitrogen, ammonia total [as N]weekly average 13.2 mg/L, tighterApr 1, 20291 mg/L (11 values)0.0758×
KERSHAW COUNTYSC0039870SCSewage plant, major2 MGDNitrogen, ammonia total [as N]monthly average 8.8 mg/L, tighterApr 1, 20290.45 mg/L (11 values)0.0511×
(Unknown Permittee)SC0029742SCIndustrial—Nitrogen, ammonia total [as N]monthly average 20 mg/L, newApr 1, 20290.1 mg/L (11 values, 6 below detection)—
(Unknown Permittee)SC0029742SCIndustrial—Nitrogen, ammonia total [as N]monthly average 7.51 lb/d, newApr 1, 20290.0124 lb/d (11 values, 6 below detection)—
BERKELEY COUNTY WATER & SANITATION AUTHORITYSC0039764SCSewage plant6 MGDNitrogen, ammonia total [as N]weekly average 9.18 mg/L, tighterApr 1, 20300.2 mg/L (11 values)0.0218×
BERKELEY COUNTY WATER & SANITATION AUTHORITYSC0039764SCSewage plant6 MGDNitrogen, ammonia total [as N]monthly average 6.12 mg/L, tighterApr 1, 20300.1 mg/L (11 values)0.0163×
BERKELEY COUNTY WATER & SANITATION AUTHORITYSC0039764SCSewage plant6 MGDNitrogen, ammonia total [as N]monthly average 459 lb/d, tighterApr 1, 20303.6 lb/d (11 values)0.00784×
BERKELEY COUNTY WATER & SANITATION AUTHORITYSC0039764SCSewage plant6 MGDNitrogen, ammonia total [as N]weekly average 689 lb/d, tighterApr 1, 20305.3 lb/d (11 values)0.00769×
Easley Combined UtilitiesSC0039853SCSewage plant, major3.5 MGDNitrogen, ammonia total [as N]monthly average 1.43 mg/L (Mar–Oct), newAug 1, 2030under 3 values—
Easley Combined UtilitiesSC0039853SCSewage plant, major3.5 MGDNitrogen, ammonia total [as N]monthly average 50 lb/d (Mar–Oct), newAug 1, 2030under 3 values—
Easley Combined UtilitiesSC0039853SCSewage plant, major3.5 MGDNitrogen, ammonia total [as N]monthly average 65 lb/d (Jan, Feb, Nov, Dec), newAug 1, 2030under 3 values—
Easley Combined UtilitiesSC0039853SCSewage plant, major3.5 MGDNitrogen, ammonia total [as N]monthly average 1.86 mg/L (Jan, Feb, Nov, Dec), newAug 1, 2030under 3 values—
Easley Combined UtilitiesSC0039853SCSewage plant, major3.5 MGDNitrogen, ammonia total [as N]weekly average 70 lb/d (Mar–Oct), newAug 1, 2030under 3 values—
Easley Combined UtilitiesSC0039853SCSewage plant, major3.5 MGDNitrogen, ammonia total [as N]weekly average 2 mg/L (Mar–Oct), newAug 1, 2030under 3 values—
Easley Combined UtilitiesSC0039853SCSewage plant, major3.5 MGDNitrogen, ammonia total [as N]weekly average 2.6 mg/L (Jan, Feb, Nov, Dec), newAug 1, 2030under 3 values—
Easley Combined UtilitiesSC0039853SCSewage plant, major3.5 MGDNitrogen, ammonia total [as N]weekly average 91 lb/d (Jan, Feb, Nov, Dec), newAug 1, 2030under 3 values—
Daniel QuattlebaumSC0048313SCSewage plant.95 MGDNitrogen, ammonia total [as N]monthly average 4.1 mg/L (Mar–Oct), tighterJan 1, 20310.1 mg/L (7 values)0.0244×
Daniel QuattlebaumSC0048313SCSewage plant.95 MGDNitrogen, ammonia total [as N]monthly average 6 mg/L (Jan, Feb, Nov, Dec), tighterJan 1, 20310.1375 mg/L (4 values)0.0229×
Daniel QuattlebaumSC0048313SCSewage plant.95 MGDNitrogen, ammonia total [as N]weekly average 9 mg/L (Jan, Feb, Nov, Dec), tighterJan 1, 20310.2 mg/L (4 values)0.0222×
Daniel QuattlebaumSC0048313SCSewage plant.95 MGDNitrogen, ammonia total [as N]weekly average 6.15 mg/L (Mar–Oct), tighterJan 1, 20310.1 mg/L (7 values)0.0163×

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=SC&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