40 CFR 133.102 - Secondary treatment.

§ 133.102 Secondary treatment.
The following paragraphs describe the minimum level of effluent quality attainable by secondary treatment in terms of the parameters—BOD5, SS and pH. All requirements for each parameter shall be achieved except as provided for in §§ 133.103 and 133.105.
(a) BOD 5.
(1) The 30-day average shall not exceed 30 mg/l.
(2) The 7-day average shall not exceed 45 mg/l.
(3) The 30-day average percent removal shall not be less than 85 percent.
(4) At the option of the NPDES permitting authority, in lieu of the parameter BOD5 and the levels of the effluent quality specified in paragraphs (a)(1), (a)(2) and (a)(3), the parameter CBOD5 may be substituted with the following levels of the CBOD5 effluent quality provided:
(i) The 30-day average shall not exceed 25 mg/l.
(ii) The 7-day average shall not exceed 40 mg/l.
(iii) The 30-day average percent removal shall not be less than 85 percent.
(b) SS.
(1) The 30-day average shall not exceed 30 mg/l.
(2) The 7-day average shall not exceed 45 mg/l.
(3) The 30-day average percent removal shall not be less than 85 percent.
(c) pH. The effluent values for pH shall be maintained within the limits of 6.0 to 9.0 unless the publicly owned treatment works demonstrates that: (1) Inorganic chemicals are not added to the waste stream as part of the treatment process; and (2) contributions from industrial sources do not cause the pH of the effluent to be less than 6.0 or greater than 9.0.
[49 FR 37006, Sept. 20, 1984; 49 FR 40405, Oct. 16, 1984]

Title 40 published on 2013-07-01

no entries appear in the Federal Register after this date.

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United States Code
U.S. Code: Title 33 - NAVIGATION AND NAVIGABLE WATERS

§ 1251 - Congressional declaration of goals and policy

§ 1251 note - Congressional declaration of goals and policy

§ 1252 - Comprehensive programs for water pollution control

§ 1252a - Reservoir projects, water storage; modification; storage for other than for water quality, opinion of Federal agency, committee...certain prescribed water quality benefits in relation to total project benefits

§ 1253 - Interstate cooperation and uniform laws

§ 1254 - Research, investigations, training, and information

§ 1254a - Research on effects of pollutants

§ 1255 - Grants for research and development

§ 1256 - Grants for pollution control programs

§ 1257 - Mine water pollution control demonstrations

§ 1257a - State demonstration programs for cleanup of abandoned mines for use as waste disposal sites; authorization of appropriations

§ 1258 - Pollution control in the Great Lakes

§ 1259 - Training grants and contracts

§ 1260 - Applications; allocation

§ 1261 - Scholarships

§ 1262 - Definitions and authorizations

§ 1263 - Alaska village demonstration projects

§ 1263a - Grants to Alaska to improve sanitation in rural and Native villages

§ 1264 - Omitted

§ 1265 - In-place toxic pollutants

§ 1266 - Hudson River reclamation demonstration project

§ 1267 - Chesapeake Bay

§ 1268 - Great Lakes

§ 1269 - Long Island Sound

§ 1270 - Lake Champlain Basin Program

§ 1271 - Sediment survey and monitoring

§ 1271a - Research and development program

§ 1272 - Environmental dredging

§ 1273 - Lake Pontchartrain Basin

§ 1274 - Watershed pilot projects

§ 1311 - Effluent limitations

§ 1314 - Information and guidelines

§ 1318 - Records and reports; inspections

§ 1342 - National pollutant discharge elimination system

§ 1345 - Disposal or use of sewage sludge

§ 1361 - Administration