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Potomac River W.R.F.

Water Supply, Potomac, Maryland. NPDES permit MD0051586, in force until Nov 30, 2030. Last 12 months: over a limit 132 times (last September 2026), 31 required values missing, 4 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: outfall 001 form A monthly (50 values), outfall 201 form A monthly (32 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
122 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 132 values over a limit
Period endingParameterReportedLimitOver by
October 2025Aluminum, total recoverable, daily maximum1304 lb/d≤ 574 lb/d127%
October 2025Aluminum, total recoverable, daily maximum16.8 mg/L≤ 8 mg/L110%
October 2025Aluminum, total recoverable, maximum monthly average632 lb/d≤ 287 lb/d120%
October 2025Aluminum, total recoverable, maximum monthly average9.3 mg/L≤ 4 mg/L133%
October 2025Iron, total [as Fe], daily maximum688 lb/d≤ 574 lb/d20%
October 2025Iron, total [as Fe], daily maximum9.7 mg/L≤ 8 mg/L21%
October 2025Solids, total suspended, daily maximum25698 lb/d≤ 4304 lb/d497%
October 2025Solids, total suspended, daily maximum526 mg/L≤ 60 mg/L777%
October 2025Solids, total suspended, maximum monthly average4314 lb/d≤ 2152 lb/d100%
October 2025Solids, total suspended, maximum monthly average68 mg/L≤ 30 mg/L127%
October 2025Turbidity, daily maximum618 NTU≤ 150 NTU—
November 2025Aluminum, total recoverable, daily maximum4153 lb/d≤ 574 lb/d624%
November 2025Aluminum, total recoverable, daily maximum53.4 mg/L≤ 8 mg/L568%
November 2025Aluminum, total recoverable, maximum monthly average1233 lb/d≤ 287 lb/d330%
November 2025Aluminum, total recoverable, maximum monthly average16.4 mg/L≤ 4 mg/L310%
November 2025Solids, total suspended, daily maximum17148 lb/d≤ 4304 lb/d298%
November 2025Solids, total suspended, daily maximum189 mg/L≤ 60 mg/L215%
November 2025Solids, total suspended, maximum monthly average5583 lb/d≤ 2152 lb/d159%
November 2025Solids, total suspended, maximum monthly average73 mg/L≤ 30 mg/L143%
November 2025Turbidity, daily maximum567 NTU≤ 150 NTU—
December 2025Aluminum, total recoverable, daily maximum2412 lb/d≤ 574 lb/d320%
December 2025Aluminum, total recoverable, daily maximum32.1 mg/L≤ 8 mg/L301%
December 2025Aluminum, total recoverable, maximum monthly average1069 lb/d≤ 287 lb/d272%
December 2025Aluminum, total recoverable, maximum monthly average14.9 mg/L≤ 4 mg/L273%
December 2025Solids, total suspended, daily maximum109 mg/L≤ 60 mg/L82%
December 2025Solids, total suspended, daily maximum8189 lb/d≤ 4304 lb/d90%
December 2025Solids, total suspended, maximum monthly average4878 lb/d≤ 2152 lb/d127%
December 2025Solids, total suspended, maximum monthly average68 mg/L≤ 30 mg/L127%
December 2025Turbidity, daily maximum190 NTU≤ 150 NTU—
January 2026Aluminum, total recoverable, daily maximum1550 lb/d≤ 574 lb/d170%
January 2026Aluminum, total recoverable, daily maximum22.8 mg/L≤ 8 mg/L185%
January 2026Aluminum, total recoverable, maximum monthly average11.5 mg/L≤ 4 mg/L188%
January 2026Aluminum, total recoverable, maximum monthly average621 lb/d≤ 287 lb/d116%
January 2026Phosphorus, total [as P], annual maximum35 lb/yr≤ 0 lb/yr—
January 2026Solids, total suspended, daily maximum134 mg/L≤ 60 mg/L123%
January 2026Solids, total suspended, daily maximum9354 lb/d≤ 4304 lb/d117%
January 2026Solids, total suspended, maximum monthly average2950 lb/d≤ 2152 lb/d37%
January 2026Solids, total suspended, maximum monthly average55 mg/L≤ 30 mg/L83%
January 2026Turbidity, daily maximum258 NTU≤ 150 NTU—
February 2026Aluminum, total recoverable, daily maximum4912 lb/d≤ 574 lb/d756%
February 2026Aluminum, total recoverable, daily maximum68 mg/L≤ 8 mg/L750%
February 2026Aluminum, total recoverable, maximum monthly average13.2 mg/L≤ 4 mg/L230%
February 2026Aluminum, total recoverable, maximum monthly average858 lb/d≤ 287 lb/d199%
February 2026Iron, total [as Fe], daily maximum1755.46 lb/d≤ 574 lb/d206%
February 2026Iron, total [as Fe], daily maximum24.3 mg/L≤ 8 mg/L204%
February 2026Solids, total suspended, daily maximum1170 mg/L≤ 60 mg/L1850%
February 2026Solids, total suspended, daily maximum84522 lb/d≤ 4304 lb/d1864%
February 2026Solids, total suspended, maximum monthly average107 mg/L≤ 30 mg/L257%
February 2026Solids, total suspended, maximum monthly average7217 lb/d≤ 2152 lb/d235%
February 2026Turbidity, daily maximum1000 NTU≤ 150 NTU—
March 2026Aluminum, total recoverable, daily maximum10.8 mg/L≤ 8 mg/L35%
March 2026Aluminum, total recoverable, daily maximum698 lb/d≤ 574 lb/d22%
March 2026Aluminum, total recoverable, maximum monthly average411 lb/d≤ 287 lb/d43%
March 2026Aluminum, total recoverable, maximum monthly average6.7 mg/L≤ 4 mg/L68%
March 2026Solids, total suspended, daily maximum6243 lb/d≤ 4304 lb/d45%
March 2026Solids, total suspended, daily maximum92 mg/L≤ 60 mg/L53%
March 2026Solids, total suspended, maximum monthly average3273 lb/d≤ 2152 lb/d52%
March 2026Solids, total suspended, maximum monthly average53 mg/L≤ 30 mg/L77%
March 2026Turbidity, daily maximum1000 NTU≤ 150 NTU—
April 2026Aluminum, total recoverable, daily maximum16.3 mg/L≤ 8 mg/L104%
April 2026Aluminum, total recoverable, daily maximum988 lb/d≤ 574 lb/d72%
April 2026Aluminum, total recoverable, maximum monthly average457 lb/d≤ 287 lb/d59%
April 2026Aluminum, total recoverable, maximum monthly average7.8 mg/L≤ 4 mg/L95%
April 2026Solids, total suspended, daily maximum143 mg/L≤ 60 mg/L138%
April 2026Solids, total suspended, daily maximum8179 lb/d≤ 4304 lb/d90%
April 2026Solids, total suspended, maximum monthly average3724 lb/d≤ 2152 lb/d73%
April 2026Solids, total suspended, maximum monthly average64 mg/L≤ 30 mg/L113%
April 2026Turbidity, daily maximum570 NTU≤ 150 NTU—
May 2026Aluminum, total recoverable, daily maximum701 lb/d≤ 574 lb/d22%
May 2026Aluminum, total recoverable, daily maximum9.6 mg/L≤ 8 mg/L20%
May 2026Aluminum, total recoverable, maximum monthly average365 lb/d≤ 287 lb/d27%
May 2026Aluminum, total recoverable, maximum monthly average5.7 mg/L≤ 4 mg/L43%
May 2026Iron, total [as Fe], daily maximum649.49 lb/d≤ 574 lb/d13%
May 2026Iron, total [as Fe], daily maximum8.7 mg/L≤ 8 mg/L9%
May 2026Iron, total [as Fe], maximum monthly average289.4 lb/d≤ 287 lb/d1%
May 2026Iron, total [as Fe], maximum monthly average4.7 mg/L≤ 4 mg/L18%
May 2026Solids, total suspended, daily maximum11790 lb/d≤ 4304 lb/d174%
May 2026Solids, total suspended, daily maximum140 mg/L≤ 60 mg/L133%
May 2026Solids, total suspended, maximum monthly average4261 lb/d≤ 2152 lb/d98%
May 2026Solids, total suspended, maximum monthly average66 mg/L≤ 30 mg/L120%
May 2026Turbidity, daily maximum1000 NTU≤ 150 NTU—
June 2026Aluminum, total recoverable, daily maximum13.1 mg/L≤ 8 mg/L64%
June 2026Aluminum, total recoverable, daily maximum773 lb/d≤ 574 lb/d35%
June 2026Aluminum, total recoverable, maximum monthly average486 lb/d≤ 287 lb/d69%
June 2026Aluminum, total recoverable, maximum monthly average8.2 mg/L≤ 4 mg/L105%
June 2026Iron, total [as Fe], daily maximum13.2 mg/L≤ 8 mg/L65%
June 2026Iron, total [as Fe], daily maximum778.98 lb/d≤ 574 lb/d36%
June 2026Iron, total [as Fe], maximum monthly average4.5 mg/L≤ 4 mg/L13%
June 2026Solids, total suspended, daily maximum134 mg/L≤ 60 mg/L123%
June 2026Solids, total suspended, daily maximum9719 lb/d≤ 4304 lb/d126%
June 2026Solids, total suspended, maximum monthly average4712 lb/d≤ 2152 lb/d119%
June 2026Solids, total suspended, maximum monthly average78 mg/L≤ 30 mg/L160%
June 2026Turbidity, daily maximum495 NTU≤ 150 NTU—
July 2026Aluminum, total recoverable, daily maximum17.1 mg/L≤ 8 mg/L114%
July 2026Aluminum, total recoverable, daily maximum993 lb/d≤ 574 lb/d73%
July 2026Aluminum, total recoverable, maximum monthly average497 lb/d≤ 287 lb/d73%
July 2026Aluminum, total recoverable, maximum monthly average8.4 mg/L≤ 4 mg/L110%
July 2026Iron, total [as Fe], daily maximum11.1 mg/L≤ 8 mg/L39%
July 2026Iron, total [as Fe], daily maximum641.72 lb/d≤ 574 lb/d12%
July 2026Iron, total [as Fe], maximum monthly average311.55 lb/d≤ 287 lb/d9%
July 2026Iron, total [as Fe], maximum monthly average5.3 mg/L≤ 4 mg/L33%
July 2026Solids, total suspended, daily maximum128 mg/L≤ 60 mg/L113%
July 2026Solids, total suspended, daily maximum7509 lb/d≤ 4304 lb/d74%
July 2026Solids, total suspended, maximum monthly average4460 lb/d≤ 2152 lb/d107%
July 2026Solids, total suspended, maximum monthly average75 mg/L≤ 30 mg/L150%
July 2026Turbidity, daily maximum326 NTU≤ 150 NTU—
August 2026Aluminum, total recoverable, daily maximum11.2 mg/L≤ 8 mg/L40%
August 2026Aluminum, total recoverable, daily maximum683 lb/d≤ 574 lb/d19%
August 2026Aluminum, total recoverable, maximum monthly average315 lb/d≤ 287 lb/d10%
August 2026Aluminum, total recoverable, maximum monthly average5.4 mg/L≤ 4 mg/L35%
August 2026Iron, total [as Fe], daily maximum17.7 mg/L≤ 8 mg/L121%
August 2026Iron, total [as Fe], daily maximum986.92 lb/d≤ 574 lb/d72%
August 2026Iron, total [as Fe], maximum monthly average574.54 lb/d≤ 287 lb/d100%
August 2026Iron, total [as Fe], maximum monthly average9.9 mg/L≤ 4 mg/L148%
August 2026Solids, total suspended, daily maximum5734 lb/d≤ 4304 lb/d33%
August 2026Solids, total suspended, daily maximum94 mg/L≤ 60 mg/L57%
August 2026Solids, total suspended, maximum monthly average3618 lb/d≤ 2152 lb/d68%
August 2026Solids, total suspended, maximum monthly average62 mg/L≤ 30 mg/L107%
August 2026Turbidity, daily maximum426 NTU≤ 150 NTU—
September 2026Aluminum, total recoverable, daily maximum1412 lb/d≤ 574 lb/d146%
September 2026Aluminum, total recoverable, daily maximum22.1 mg/L≤ 8 mg/L176%
September 2026Aluminum, total recoverable, maximum monthly average468 lb/d≤ 287 lb/d63%
September 2026Aluminum, total recoverable, maximum monthly average8.1 mg/L≤ 4 mg/L103%
September 2026Iron, total [as Fe], daily maximum1394.2 lb/d≤ 574 lb/d143%
September 2026Iron, total [as Fe], daily maximum22.9 mg/L≤ 8 mg/L186%
September 2026Iron, total [as Fe], maximum monthly average287.15 lb/d≤ 287 lb/d0%
September 2026Iron, total [as Fe], maximum monthly average5 mg/L≤ 4 mg/L25%
September 2026Solids, total suspended, daily maximum15077 lb/d≤ 4304 lb/d250%
September 2026Solids, total suspended, daily maximum236 mg/L≤ 60 mg/L293%
September 2026Solids, total suspended, maximum monthly average4003 lb/d≤ 2152 lb/d86%
September 2026Solids, total suspended, maximum monthly average70 mg/L≤ 30 mg/L133%
September 2026Turbidity, daily maximum264 NTU≤ 150 NTU—

Limits in force (82)

ParameterStatisticLimitMonthsOutfall
Turbiditymaximum monthly average≤ 50 NTUall year001
Turbiditydaily maximum≤ 150 NTUall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmaximum monthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 60 mg/Lall year001
Solids, total suspendedmaximum monthly average≤ 2152 lb/dall year001
Solids, total suspendeddaily maximum≤ 4304 lb/dall year001
Solids, total suspendedcumulative totalreport only (lb/yr)all year001
Solids, total suspendedmonthly totalreport only (lb/mo)all year001
Solids, total suspendedannual maximum≤ 0 lb/yrall year001
Solids, total suspendedmonthly totalreport only (lb/mo)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, total [as N]daily maximumreport only (lb/d)all year001
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all year001
Nitrogen, total [as N]monthly totalreport only (lb/mo)all year001
Nitrogen, total [as N]annual maximum≤ 0 lb/yrall year001
Nitrogen, total [as N]monthly totalreport only (lb/mo)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
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
Phosphorus, total [as P]monthly totalreport only (lb/mo)all year001
Phosphorus, total [as P]annual maximum≤ 0 lb/yrall year001
Phosphorus, total [as P]monthly totalreport only (lb/mo)all year001
Iron, total [as Fe]maximum monthly average≤ 4 mg/Lall year001
Iron, total [as Fe]daily maximum≤ 8 mg/Lall year001
Iron, total [as Fe]maximum monthly average≤ 287 lb/dall year001
Iron, total [as Fe]daily maximum≤ 574 lb/dall year001
Manganese, total [as Mn]monthly averagereport only (mg/L)all year001
Manganese, total [as Mn]daily maximumreport only (mg/L)all year001
Manganese, total [as Mn]monthly averagereport only (lb/d)all year001
Aluminum, total recoverablemaximum monthly average≤ 4 mg/Lall year001
Aluminum, total recoverabledaily maximum≤ 8 mg/Lall year001
Aluminum, total recoverablemaximum monthly average≤ 287 lb/dall year001
Aluminum, total recoverabledaily maximum≤ 574 lb/dall 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 residualmonthly averagereport only (mg/L)all year001
Chlorine, total residualdaily maximum≤ .1 mg/Lall year001
Nitrogen, Kjeldahl Totalmonthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl Totaldaily maximumreport only (mg/L)all year001
Flow, dischargemaximumreport only (MGD)all year001
Flow, totaldaily maximumreport only (Mgal/mo)all year001
pH range excursions, > 60 minutesmaximumreport only (occur/d)all year001
Turbiditymonthly averagereport only (NTU)all year201
Turbiditydaily maximumreport only (NTU)all year201
Coagulants addedmonthly averagereport only (lb/mo)all year201
Coagulants addedcumulative totalreport only (lb/yr)all year201
Coagulants addedmonthly loadreport only (lb/mo)all year201
pHminimumreport only (SU)all year201
pHmaximumreport only (SU)all year201
Solids, total suspendedmonthly totalreport only (lb/mo)all year201
Solids, total suspendedannual totalreport only (lb/yr)all year201
Solids, total suspendedmonthly averagereport only (mg/L)all year201
Solids, total suspendeddaily maximumreport only (mg/L)all year201
Solids, total suspendedmonthly averagereport only (lb/d)all year201
Solids, total suspendeddaily maximumreport only (lb/d)all year201
Nitrogen, total [as N]monthly totalreport only (lb/mo)all year201
Nitrogen, total [as N]annual totalreport only (lb/yr)all year201
Nitrogen, total [as N]monthly averagereport only (mg/L)all year201
Nitrogen, total [as N]daily maximumreport only (mg/L)all year201
Nitrogen, total [as N]monthly averagereport only (lb/d)all year201
Nitrogen, total [as N]daily maximumreport only (lb/d)all year201
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year201
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year201
Phosphorus, total [as P]monthly totalreport only (lb/mo)all year201
Phosphorus, total [as P]annual totalreport only (lb/yr)all year201
Phosphorus, total [as P]monthly averagereport only (mg/L)all year201
Phosphorus, total [as P]daily maximumreport only (mg/L)all year201
Phosphorus, total [as P]monthly averagereport only (lb/d)all year201
Phosphorus, total [as P]daily maximumreport only (lb/d)all year201
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year201
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year201
Nitrogen, Kjeldahl Totalmonthly averagereport only (mg/L)all year201
Nitrogen, Kjeldahl Totaldaily maximumreport only (mg/L)all year201
Flow, totalmonthly totalreport only (Mgal/mo)all year201

How strict are these limits?

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

Same industry: the 18 Water Supply permits in Maryland.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0051586 · MCP: https://passage-data.com/mcp