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High Ridge WWTP

Sewage treatment plant, Aurora, Indiana. NPDES permit IN0063525, in force until Nov 30, 2029. Last 12 months: over a limit 65 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (24 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
34 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 65 values over a limit
Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, daily minimum.1 mg/L≥ .5 mg/L80%
October 2025Chlorine, total residual, daily maximum.34 mg/L≤ .06 mg/L467%
October 2025E. coli, colony forming units [CFU], daily maximum63200 CFU/100mL≤ 235 CFU/100mL26794%
October 2025E. coli, colony forming units [CFU], monthly geometric mean201 CFU/100mL≤ 125 CFU/100mL61%
October 2025Nitrogen, ammonia total [as N], maximum weekly average3.55 mg/L≤ 2.4 mg/L48%
November 2025Nitrogen, ammonia total [as N], monthly average.46 lb/d≤ .27 lb/d70%
November 2025Nitrogen, ammonia total [as N], monthly average3.62 mg/L≤ 1.6 mg/L126%
November 2025Nitrogen, ammonia total [as N], maximum weekly average1.12 lb/d≤ .4 lb/d180%
November 2025Nitrogen, ammonia total [as N], maximum weekly average7.16 mg/L≤ 2.4 mg/L198%
November 2025Solids, total suspended, monthly average20.8 mg/L≤ 18 mg/L16%
November 2025Solids, total suspended, maximum weekly average31.5 mg/L≤ 27 mg/L17%
December 2025Nitrogen, ammonia total [as N], maximum weekly average8.34 mg/L≤ 4.8 mg/L74%
January 2026Solids, total suspended, monthly average61.3 mg/L≤ 30 mg/L104%
January 2026Solids, total suspended, maximum weekly average20.57 lb/d≤ 7.5 lb/d174%
January 2026Solids, total suspended, maximum weekly average307 mg/L≤ 45 mg/L582%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average44.8 mg/L≤ 25 mg/L79%
February 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average103.5 mg/L≤ 40 mg/L159%
February 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average8.88 lb/d≤ 6.7 lb/d33%
February 2026Solids, total suspended, monthly average379 mg/L≤ 30 mg/L1163%
February 2026Solids, total suspended, monthly average39.49 lb/d≤ 5 lb/d690%
February 2026Solids, total suspended, maximum weekly average112.1 lb/d≤ 7.5 lb/d1395%
February 2026Solids, total suspended, maximum weekly average1124 mg/L≤ 45 mg/L2398%
March 2026Nitrogen, ammonia total [as N], monthly average.92 lb/d≤ .53 lb/d74%
March 2026Nitrogen, ammonia total [as N], monthly average5.6 mg/L≤ 3.2 mg/L75%
March 2026Nitrogen, ammonia total [as N], maximum weekly average2.17 lb/d≤ .8 lb/d171%
March 2026Nitrogen, ammonia total [as N], maximum weekly average8.53 mg/L≤ 4.8 mg/L78%
March 2026Solids, total suspended, monthly average13.1 lb/d≤ 5 lb/d162%
March 2026Solids, total suspended, monthly average93.9 mg/L≤ 30 mg/L213%
March 2026Solids, total suspended, maximum weekly average299.3 mg/L≤ 45 mg/L565%
March 2026Solids, total suspended, maximum weekly average45.03 lb/d≤ 7.5 lb/d500%
April 2026Chlorine, total residual, daily minimum.1 mg/L≥ .5 mg/L80%
April 2026Chlorine, total residual, daily maximum3.1 mg/L≤ .06 mg/L5067%
April 2026Chlorine, total residual, monthly average.49 mg/L≤ .06 mg/L717%
April 2026E. coli, colony forming units [CFU], daily maximum63200 CFU/100mL≤ 235 CFU/100mL26794%
April 2026E. coli, colony forming units [CFU], monthly geometric mean791 CFU/100mL≤ 125 CFU/100mL533%
April 2026Nitrogen, ammonia total [as N], monthly average.64 lb/d≤ .53 lb/d21%
April 2026Nitrogen, ammonia total [as N], monthly average5.39 mg/L≤ 3.2 mg/L68%
April 2026Nitrogen, ammonia total [as N], maximum weekly average1.37 lb/d≤ .8 lb/d71%
April 2026Nitrogen, ammonia total [as N], maximum weekly average14.81 mg/L≤ 4.8 mg/L209%
April 2026Solids, total suspended, monthly average5.51 lb/d≤ 5 lb/d10%
April 2026Solids, total suspended, monthly average61.3 mg/L≤ 30 mg/L104%
April 2026Solids, total suspended, maximum weekly average17.43 lb/d≤ 7.5 lb/d132%
April 2026Solids, total suspended, maximum weekly average184.8 mg/L≤ 45 mg/L311%
May 2026Chlorine, total residual, daily minimum.2 mg/L≥ .5 mg/L60%
May 2026Chlorine, total residual, daily maximum6 mg/L≤ .06 mg/L9900%
May 2026Chlorine, total residual, monthly average1.56 mg/L≤ .06 mg/L2500%
May 2026E. coli, colony forming units [CFU], daily maximum63200 CFU/100mL≤ 235 CFU/100mL26794%
May 2026Nitrogen, ammonia total [as N], monthly average.34 lb/d≤ .27 lb/d26%
May 2026Nitrogen, ammonia total [as N], monthly average2.24 mg/L≤ 1.6 mg/L40%
May 2026Nitrogen, ammonia total [as N], maximum weekly average1.23 lb/d≤ .4 lb/d208%
May 2026Nitrogen, ammonia total [as N], maximum weekly average7.78 mg/L≤ 2.4 mg/L224%
May 2026Solids, total suspended, monthly average37.1 mg/L≤ 18 mg/L106%
May 2026Solids, total suspended, maximum weekly average4.62 lb/d≤ 4.5 lb/d3%
May 2026Solids, total suspended, maximum weekly average80.5 mg/L≤ 27 mg/L198%
June 2026Chlorine, total residual, daily minimum.1 mg/L≥ .5 mg/L80%
June 2026Chlorine, total residual, daily maximum.98 mg/L≤ .06 mg/L1533%
June 2026Chlorine, total residual, monthly average.2 mg/L≤ .06 mg/L233%
June 2026E. coli, colony forming units [CFU], daily maximum411 CFU/100mL≤ 235 CFU/100mL75%
July 2026Chlorine, total residual, daily maximum.85 mg/L≤ .06 mg/L1317%
July 2026Chlorine, total residual, monthly average.46 mg/L≤ .06 mg/L667%
July 2026Nitrogen, ammonia total [as N], maximum weekly average.45 lb/d≤ .4 lb/d13%
August 2026Chlorine, total residual, daily minimum.2 mg/L≥ .5 mg/L60%
August 2026Chlorine, total residual, daily maximum.58 mg/L≤ .06 mg/L867%
August 2026Chlorine, total residual, monthly average.26 mg/L≤ .06 mg/L333%
August 2026E. coli, colony forming units [CFU], daily maximum1120 CFU/100mL≤ 235 CFU/100mL377%

Limits in force (37)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/LMay–Nov
Oxygen, dissolved [DO]daily average minimum≥ 5 mg/LJan, Feb, Mar, Apr, Dec
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 18 mg/LMay–Nov
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 27 mg/LMay–Nov
Solids, total suspendedmonthly average≤ 5 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 3 lb/dMay–Nov
Solids, total suspendedmaximum weekly average≤ 7.5 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 4.5 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.6 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 3.2 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.4 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 4.8 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ .27 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ .53 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ .4 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ .8 lb/dJan, Feb, Mar, Apr, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .06 mg/LApr–Oct
Chlorine, total residualdaily maximum≤ .06 mg/LApr–Oct
Chlorine, total residualdaily minimum≥ .5 mg/LApr–Oct
Chlorine, total residualdaily maximumreport only (mg/L)Apr–Oct
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct
E. coli, colony forming units [CFU]daily maximumreport only (CFU/100mL)Apr–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 23 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4.2 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.5 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 6.7 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 3.8 lb/dMay–Nov
Flow, totalmonthly totalreport only (Mgal/mo)all year

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/IN0063525 · MCP: https://passage-data.com/mcp