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Gnaw Bone Regional Sewer District

Sewage treatment plant, Nashville, Indiana. NPDES permit IN0060526, in force until Oct 31, 2029. Last 12 months: over a limit 88 times (last September 2026), 3 required values missing, 2 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (19 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
23 values over a limit, 3 required values missing, 3 of 12 reports late

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

All 88 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], monthly average17 mg/L≤ 15 mg/L13%
October 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average29 mg/L≤ 23 mg/L26%
October 2025E. coli, colony forming units [CFU], daily maximum2420 CFU/100mL≤ 235 CFU/100mL930%
October 2025E. coli, colony forming units [CFU], monthly geometric mean2420 CFU/100mL≤ 125 CFU/100mL1836%
October 2025Solids, total suspended, monthly average7.6 lb/d≤ 7.5 lb/d1%
October 2025Solids, total suspended, monthly average94.4 mg/L≤ 18 mg/L424%
October 2025Solids, total suspended, maximum weekly average13.04 lb/d≤ 11.3 lb/d15%
October 2025Solids, total suspended, maximum weekly average153 mg/L≤ 27 mg/L467%
November 2025BOD, carbonaceous [5 day, 20 C], monthly average22.8 mg/L≤ 15 mg/L52%
November 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average29 mg/L≤ 23 mg/L26%
November 2025Oxygen, dissolved [DO], daily average minimum1 mg/L≥ 6 mg/L83%
November 2025Solids, total suspended, monthly average130.8 mg/L≤ 18 mg/L627%
November 2025Solids, total suspended, monthly average20.19 lb/d≤ 7.5 lb/d169%
November 2025Solids, total suspended, maximum weekly average212 mg/L≤ 27 mg/L685%
November 2025Solids, total suspended, maximum weekly average32.83 lb/d≤ 11.3 lb/d191%
December 2025Solids, total suspended, monthly average37.8 mg/L≤ 30 mg/L26%
January 2026Solids, total suspended, monthly average137.5 mg/L≤ 30 mg/L358%
January 2026Solids, total suspended, maximum weekly average207 mg/L≤ 45 mg/L360%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average10.93 lb/d≤ 10.4 lb/d5%
February 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average18.21 lb/d≤ 16.7 lb/d9%
February 2026Nitrogen, ammonia total [as N], maximum weekly average4.6 mg/L≤ 2.7 mg/L70%
February 2026Solids, total suspended, monthly average155.8 mg/L≤ 30 mg/L419%
February 2026Solids, total suspended, monthly average73.17 lb/d≤ 12.5 lb/d485%
February 2026Solids, total suspended, maximum weekly average200.6 lb/d≤ 18.8 lb/d967%
February 2026Solids, total suspended, maximum weekly average334 mg/L≤ 45 mg/L642%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average28.18 lb/d≤ 10.4 lb/d171%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average68.5 mg/L≤ 25 mg/L174%
March 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average136 mg/L≤ 40 mg/L240%
March 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average45.82 lb/d≤ 16.7 lb/d174%
March 2026Nitrogen, ammonia total [as N], monthly average3.726 lb/d≤ .8 lb/d366%
March 2026Nitrogen, ammonia total [as N], monthly average9.9 mg/L≤ 1.8 mg/L450%
March 2026Nitrogen, ammonia total [as N], maximum weekly average12.5 mg/L≤ 2.7 mg/L363%
March 2026Nitrogen, ammonia total [as N], maximum weekly average4.276 lb/d≤ 1.1 lb/d289%
March 2026Solids, total suspended, monthly average225.6 mg/L≤ 30 mg/L652%
March 2026Solids, total suspended, monthly average98.82 lb/d≤ 12.5 lb/d691%
March 2026Solids, total suspended, maximum weekly average176 lb/d≤ 18.8 lb/d836%
March 2026Solids, total suspended, maximum weekly average323 mg/L≤ 45 mg/L618%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average30.87 lb/d≤ 10.4 lb/d197%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average83.7 mg/L≤ 25 mg/L235%
April 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average212 mg/L≤ 40 mg/L430%
April 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average81.48 lb/d≤ 16.7 lb/d388%
April 2026E. coli, colony forming units [CFU], daily maximum2420 CFU/100mL≤ 235 CFU/100mL930%
April 2026E. coli, colony forming units [CFU], monthly geometric mean836 CFU/100mL≤ 125 CFU/100mL569%
April 2026Nitrogen, ammonia total [as N], monthly average21.7 mg/L≤ 1.8 mg/L1106%
April 2026Nitrogen, ammonia total [as N], monthly average7.368 lb/d≤ .8 lb/d821%
April 2026Nitrogen, ammonia total [as N], maximum weekly average26.6 mg/L≤ 2.7 mg/L885%
April 2026Nitrogen, ammonia total [as N], maximum weekly average8.455 lb/d≤ 1.1 lb/d669%
April 2026Solids, total suspended, monthly average180.3 mg/L≤ 30 mg/L501%
April 2026Solids, total suspended, monthly average67.11 lb/d≤ 12.5 lb/d437%
April 2026Solids, total suspended, maximum weekly average166.4 lb/d≤ 18.8 lb/d785%
April 2026Solids, total suspended, maximum weekly average433 mg/L≤ 45 mg/L862%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average21.8 mg/L≤ 15 mg/L45%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average8.912 lb/d≤ 6.3 lb/d41%
May 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average16.5 lb/d≤ 9.6 lb/d72%
May 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average47 mg/L≤ 23 mg/L104%
May 2026E. coli, colony forming units [CFU], daily maximum1990 CFU/100mL≤ 235 CFU/100mL747%
May 2026E. coli, colony forming units [CFU], monthly geometric mean281 CFU/100mL≤ 125 CFU/100mL125%
May 2026Nitrogen, ammonia total [as N], monthly average13.47 mg/L≤ 1.3 mg/L936%
May 2026Nitrogen, ammonia total [as N], monthly average5.76 lb/d≤ .5 lb/d1052%
May 2026Nitrogen, ammonia total [as N], maximum weekly average23.1 mg/L≤ 2 mg/L1055%
May 2026Nitrogen, ammonia total [as N], maximum weekly average8.111 lb/d≤ .8 lb/d914%
May 2026Oxygen, dissolved [DO], daily average minimum5.4 mg/L≥ 6 mg/L10%
May 2026Solids, total suspended, monthly average13.79 lb/d≤ 7.5 lb/d84%
May 2026Solids, total suspended, monthly average32.5 mg/L≤ 18 mg/L81%
May 2026Solids, total suspended, maximum weekly average22.66 lb/d≤ 11.3 lb/d101%
May 2026Solids, total suspended, maximum weekly average49 mg/L≤ 27 mg/L81%
May 2026pH, daily maximum9.5 SU≤ 9 SU—
July 2026E. coli, colony forming units [CFU], daily maximum2420 CFU/100mL≤ 235 CFU/100mL930%
July 2026E. coli, colony forming units [CFU], monthly geometric mean254 CFU/100mL≤ 125 CFU/100mL103%
July 2026Nitrogen, ammonia total [as N], monthly average10.41 mg/L≤ 1.3 mg/L701%
July 2026Nitrogen, ammonia total [as N], monthly average2.511 lb/d≤ .5 lb/d402%
July 2026Nitrogen, ammonia total [as N], maximum weekly average18 mg/L≤ 2 mg/L800%
July 2026Nitrogen, ammonia total [as N], maximum weekly average3.563 lb/d≤ .8 lb/d345%
August 2026E. coli, colony forming units [CFU], daily maximum2420 CFU/100mL≤ 235 CFU/100mL930%
August 2026Nitrogen, ammonia total [as N], monthly average2.582 lb/d≤ .5 lb/d416%
August 2026Nitrogen, ammonia total [as N], monthly average4.075 mg/L≤ 1.3 mg/L213%
August 2026Nitrogen, ammonia total [as N], maximum weekly average10.23 lb/d≤ .8 lb/d1179%
August 2026Nitrogen, ammonia total [as N], maximum weekly average16 mg/L≤ 2 mg/L700%
August 2026Solids, total suspended, monthly average12.3 lb/d≤ 7.5 lb/d64%
August 2026Solids, total suspended, monthly average22.8 mg/L≤ 18 mg/L27%
August 2026Solids, total suspended, maximum weekly average39.63 lb/d≤ 11.3 lb/d251%
August 2026Solids, total suspended, maximum weekly average62 mg/L≤ 27 mg/L130%
September 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average26 mg/L≤ 23 mg/L13%
September 2026E. coli, colony forming units [CFU], daily maximum1990 CFU/100mL≤ 235 CFU/100mL747%
September 2026E. coli, colony forming units [CFU], monthly geometric mean328 CFU/100mL≤ 125 CFU/100mL162%
September 2026Nitrogen, ammonia total [as N], maximum weekly average.927 lb/d≤ .8 lb/d16%
September 2026Nitrogen, ammonia total [as N], maximum weekly average3.3 mg/L≤ 2 mg/L65%
September 2026Solids, total suspended, maximum weekly average31 mg/L≤ 27 mg/L15%

Limits in force (32)

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≤ 12.5 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 7.5 lb/dMay–Nov
Solids, total suspendedmaximum weekly average≤ 18.8 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 11.3 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 2 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.7 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ .5 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ .8 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ .8 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 1.1 lb/dJan, Feb, Mar, Apr, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
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
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≤ 10.4 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 6.3 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 16.7 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 9.6 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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