Guidance for Conducting a Pollution Scan for Publicly Owned Treatment Works
This guidance document is advisory in nature but is binding on an agency until amended by such agency. A guidance document does not include internal procedural documents that only affect the internal operations of the agency and does not impose additional requirements or penalties on regulated parties or include confidential information or rules and regulations made in accordance with the Administrative Procedure Act. If you believe that this guidance document imposes additional requirements or penalties on regulated parties, you may request a review of the document.

Form #:  18-002
Guidance Documents
Revised: 1/11/18


The Clean Water Act regulations promulgated under 40 CFR 122.21(j) requires all publicly owned treatment works (POTWs) to provide data from a minimum of three samples taken within four and one-half years prior to the date of the permit application. Samples must be representative of the seasonal variation in the discharge from each outfall and the analytical results provided with the NPDES permit application.

The permittee shall monitor the effluent for the parameters set forth below using the analytical methods in 40 CFR 136. Monitoring is required to be completed three times during the current permit term with testing in the first, third and fifth year of the permit and must be representative of the seasonal variation in the discharge. The analytical data obtained from the monitoring shall be submitted as an attachment to the next NPDES permit application.

All POTWs are required to submit NPDES Combined Form 1 & 2A, National Pollutant Discharge Elimination System Permit Application for a Facility Discharging Domestic Wastewater six months prior to permit expiration. These sampling requirements must be met at that time and the analytical results attached. If any pollutants listed above are monitored in the accompanying NPDES permit, redundant sampling will not be necessary.

The Clean Water Act regulations promulgated under 40 CFR 122.21(j) requires all POTWs to provide analytical results for the following pollutants (Storet code in brackets):
  • Biochemical oxygen demand (BOD–5 or CBOD–5) [00310 or 80082]
  • Fecal coliform (unless E. coli is a current permit requirement) [31615 or 31648]
  • Design Flow Rate [50050]
  • pH [00400]
  • Temperature [00011]
  • Total suspended solids [00530]
The Clean Water Act regulations promulgated under 40 CFR 122.21(j) requires all POTWs with a design flow of 0.1 MGD or greater to provide the following additional data:

Additional Monitoring for POTWs with a Design Flow of 0.1 - 0.99 MGD
  • Ammonia (as N) [00610]
  • Chlorine (total residual, TRC), if chlorine is used for disinfection [50060]
  • Dissolved oxygen [00300]
  • Nitrate/Nitrite [00630]
  • Kjeldahl nitrogen [00625]
  • Oil and grease [00552]
  • Phosphorus [00665]
  • Total dissolved solids [70295]
Additional Monitoring for POTWs with a Design Flow of 1.0 MGD or Greater
The Clean Water Act regulations promulgated under 40 CFR 122.21(j) requires POTWs with a Design flow of 1.0 MGD or greater to provide the following additional data:


Metals Monitoring
Parameters
Units
Storet Code
Result
Method detection limit
Monitoring Frequency
Sample
Type
Antimony, Total Recoverable
µg/L
01268
Report
Report
Three times per permit term
24 hour composite
Arsenic, Total Recoverable
µg/L
00978
Report
Report
Three times per permit term
24 hour composite
Beryllium, Total Recoverable
µg/L
00998
Report
Report
Three times per permit term
24 hour composite
Cadmium, Total Recoverable
µg/L
01113
Report
Report
Three times per permit term
24 hour composite
Chromium, Total Recoverable
µg/L
01118
Report
Report
Three times per permit term
24 hour composite
Copper, Total Recoverable
µg/L
01119
Report
Report
Three times per permit term
24 hour composite
Lead, Total Recoverable
µg/L
01114
Report
Report
Three times per permit term
24 hour composite
Mercury, Total Recoverable
µg/L
71901
Report
Report
Three times per permit term
24 hour composite
Nickel, Total Recoverable
µg/L
01074
Report
Report
Three times per permit term
24 hour composite
Selenium, Total Recoverable
µg/L
00981
Report
Report
Three times per permit term
24 hour composite
Silver, Total Recoverable
µg/L
01079
Report
Report
Three times per permit term
24 hour composite
Thallium, Total Recoverable
µg/L
00982
Report
Report
Three times per permit term
24 hour composite
Zinc, Total Recoverable
µg/L
01094
Report
Report
Three times per permit term
24 hour composite
Inorganic Compounds
Parameters
Units
Storet Code
Result
Method detection limit
Monitoring Frequency (b)
Sample
Type
Cyanide
mg/L
00720
Report
Report
Three times per permit term
24 hour composite
Total Phenolic Compounds
mg/L
70029
Report
Report
Three times per permit term
24 hour composite
Total Phosphorus
mg/L
00665
Report
Report
Three times per permit term
24 hour composite
Hardness, as CaCO3
mg/L
00900
Report
Report
Three times per permit term
24 hour composite
Volatile Organic Compounds (VOCs)
Parameters
Units
Storet Code
Result
Method detection limit
Monitoring Frequency
Sample
Type
Acrolein
µg/L
34210
Report
Report
Three times per permit term
Grab
Acrylonitrile
µg/L
34215
Report
Report
Three times per permit term
Grab
Benzene
µg/L
34030
Report
Report
Three times per permit term
Grab
Bromoform
µg/L
32104
Report
Report
Three times per permit term
Grab
Carbon Tetrachloride
µg/L
32102
Report
Report
Three times per permit term
Grab
Chlorobenzene
µg/L
34301
Report
Report
Three times per permit term
Grab
Chlorodibromomethane
µg/L
32105
Report
Report
Three times per permit term
Grab
Chloroethane
µg/L
85811
Report
Report
Three times per permit term
Grab
2-Choroethylvinyl Ether
µg/L
34576
Report
Report
Three times per permit term
Grab
Chloroform
µg/L
32106
Report
Report
Three times per permit term
Grab
Dichorobromomethane
µg/L
32101
Report
Report
Three times per permit term
Grab
1,1-Dichloroethane
µg/L
34496
Report
Report
Three times per permit term
Grab
1.2-Dichloroethane
µg/L
32103
Report
Report
Three times per permit term
Grab
Trans 1,2-Dichloroethylene
µg/L
34546
Report
Report
Three times per permit term
Grab
1,1-Dichroethylene
µg/L
34501
Report
Report
Three times per permit term
Grab
1,2-Dichloropropane
µg/L
34541
Report
Report
Three times per permit term
Grab
1,3-Dichloropropylene
µg/L
77163
Report
Report
Three times per permit term
Grab
Ethylbenzene
µg/L
34371
Report
Report
Three times per permit term
Grab
Methyl Bromide
µg/L
34413
Report
Report
Three times per permit term
Grab
Methyl Chloride
µg/L
34418
Report
Report
Three times per permit term
Grab
Methylene Chloride
µg/L
34423
Report
Report
Three times per permit term
Grab
1,1,2,2-Tetrachloroethane
µg/L
34516
Report
Report
Three times per permit term
Grab
Tetrachloroethylene
µg/L
34475
Report
Report
Three times per permit term
Grab
Toluene
µg/L
34010
Report
Report
Three times per permit term
Grab
1,1,1-Trichloroethane
µg/L
34506
Report
Report
Three times per permit term
Grab
1,1,2-Trichloroethane
µg/L
34511
Report
Report
Three times per permit term
Grab
Trichloroethylene
µg/L
39180
Report
Report
Three times per permit term
Grab
Vinyl Chloride
µg/L
39175
Report
Report
Three times per permit term
Grab
Acid Extractable Compounds
Parameters
Units
Storet Code
Result
Method detection limit
Monitoring Frequency
Sample
Type
p-Chloro-m-Cresol
µg/L
70021
Report
Report
Three times per permit term
24 hour composite
2-Chlorophenol
µg/L
34586
Report
Report
Three times per permit term
24 hour composite
2,4-Dichlorophenol
µg/L
34601
Report
Report
Three times per permit term
24 hour composite
2,4-Dimethylphenol
µg/L
34606
Report
Report
Three times per permit term
24 hour composite
4,6-Dinitro-o-Cresol
µg/L
03615
Report
Report
Three times per permit term
24 hour composite
2,4-Dintrophenol
µg/L
34616
Report
Report
Three times per permit term
24 hour composite
2-Nitrophenol
µg/L
34591
Report
Report
Three times per permit term
24 hour composite
4-Nitrophenol
µg/L
34646
Report
Report
Three times per permit term
24 hour composite
Pentachlorophenol
µg/L
39032
Report
Report
Three times per permit term
24 hour composite
Phenol
µg/L
34694
Report
Report
Three times per permit term
24 hour composite
2,4,6-Trichlorophenol
µg/L
34621
Report
Report
Three times per permit term
24 hour composite
Base Neutral Compounds
Parameters
Units
Storet Code
Result
Method detection limit
Monitoring Frequency
Sample
Type
Acenaphthene
µg/L
34205
Report
Report
Three times per permit term
24 hour composite
Acenaphthylene
µg/L
34200
Report
Report
Three times per permit term
24 hour composite
Anthracene
µg/L
34220
Report
Report
Three times per permit term
24 hour composite
Benzidine
µg/L
39120
Report
Report
Three times per permit term
24 hour composite
Benzo(a)anthracene
µg/L
34526
Report
Report
Three times per permit term
24 hour composite
Benzo(a)pyrene
µg/L
34247
Report
Report
Three times per permit term
24 hour composite
3,4 Benzo-fluoranthene
µg/L
34230
Report
Report
Three times per permit term
24 hour composite
Benzo(ghi)perylene
µg/L
34521
Report
Report
Three times per permit term
24 hour composite
Benzo(k)fluoranthene
µg/L
34242
Report
Report
Three times per permit term
24 hour composite
Bis (2-chloroethoxy)methane
µg/L
34278
Report
Report
Three times per permit term
24 hour composite
Bis (2-chloroethyl)ether
µg/L
34273
Report
Report
Three times per permit term
24 hour composite
Bis (2-chlorosiopropyl)ether
µg/L
34283
Report
Report
Three times per permit term
24 hour composite
Bis (2-ethylhexyl)phthalate
µg/L
39100
Report
Report
Three times per permit term
24 hour composite
4-bromophenyl phenylether
µg/L
34636
Report
Report
Three times per permit term
24 hour composite
Butyl benzyl phthalate
µg/L
34292
Report
Report
Three times per permit term
24 hour composite
Base Neutral Compounds
Parameters
Units
Storet Code
Result
Method detection limit
Monitoring Frequency
Sample
Type
2-Chloronaphthalene
µg/L
34581
Report
Report
Three times per permit term
24 hour composite
4-Chorphenyl phenyl ether
µg/L
34641
Report
Report
Three times per permit term
24 hour composite
Chrysene
µg/L
34320
Report
Report
Three times per permit term
24 hour composite
Di-N-butyl phthalate
µg/L
39110
Report
Report
Three times per permit term
24 hour composite
Di-N-octyl phthalate
µg/L
34596
Report
Report
Three times per permit term
24 hour composite
Dibenzo(A,H) anthracene
µg/L
34556
Report
Report
Three times per permit term
24 hour composite
1,2-Dichorobenzene
µg/L
34536
Report
Report
Three times per permit term
24 hour composite
1,3-Dichlorobenzene
µg/L
34566
Report
Report
Three times per permit term
24 hour composite
1,4-Dichlorobenzene
µg/L
34571
Report
Report
Three times per permit term
24 hour composite
3,3-Dichlorobenzidine
µg/L
34631
Report
Report
Three times per permit term
24 hour composite
Diethyl phthalate
µg/L
34336
Report
Report
Three times per permit term
24 hour composite
Dimethyl phthalate
µg/L
34341
Report
Report
Three times per permit term
24 hour composite
2,4-Dinitrotoluene
µg/L
34611
Report
Report
Three times per permit term
24 hour composite
2,6-Dinitrotolune
µg/L
34626
Report
Report
Three times per permit term
24 hour composite
1,2-Diphenylhydrazine
µg/L
34346
Report
Report
Three times per permit term
24 hour composite
Base Neutral Compounds
Parameters
Units
Storet Code
Result
Method detection limit
Monitoring Frequency
Sample
Type
Fluoranthene
µg/L
34376
Report
Report
Three times per permit term
24 hour composite
Fluorene
µg/L
34381
Report
Report
Three times per permit term
24 hour composite
Hexachlorobenzene
µg/L
39700
Report
Report
Three times per permit term
24 hour composite
Hexachlorobutadiene
µg/L
34391
Report
Report
Three times per permit term
24 hour composite
Hexachlorocyclopentadiene
µg/L
34386
Report
Report
Three times per permit term
24 hour composite
Indeno(1,2,3-CD)pyrene
µg/L
34403
Report
Report
Three times per permit term
24 hour composite
Isophorone
µg/L
34408
Report
Report
Three times per permit term
24 hour composite
Naphthalene
µg/L
34696
Report
Report
Three times per permit term
24 hour composite
Nitrobenzene
µg/L
34447
Report
Report
Three times per permit term
24 hour composite
N-Nitrosodi-N-propylamine
µg/L
34428
Report
Report
Three times per permit term
24 hour composite
N-Nitroso-methylamine
µg/L
34438
Report
Report
Three times per permit term
24 hour composite
N-Nitroso-phenylamine
µg/L
34433
Report
Report
Three times per permit term
24 hour composite
Phenanthrene
µg/L
34461
Report
Report
Three times per permit term
24 hour composite
Pyrene
µg/L
34469
Report
Report
Three times per permit term
24 hour composite
1,2,4-Trichlorobenzene
µg/L
34551
Report
Report
Three times per permit term
24 hour composite