[Code of Federal Regulations]
[Title 40, Volume 21]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR125.65]

[Page 325-326]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 125_CRITERIA AND STANDARDS FOR THE NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM--Table of Contents
 
 Subpart G_Criteria for Modifying the Secondary Treatment Requirements 
               Under Section 301(h) of the Clean Water Act
 
Sec.  125.65  Urban area pretreatment program.

    (a) Scope and applicability. (1) The requirements of this section 
apply to each POTW serving a population of 50,000 or more that has one 
or more toxic pollutants introduced into the POTW by one or more 
industrial dischargers and that seeks a section 301(h) modification.
    (2) The requirements of this section apply in addition to any 
applicable requirements of 40 CFR part 403, and do not waive or 
substitute for the part 403 requirements in any way.
    (b) Toxic pollutant control. (1) As to each toxic pollutant 
introduced by an industrial discharger, each POTW subject to the 
requirements of this section shall demonstrate that it either:
    (i) Has an applicable pretreatment requirement in effect in 
accordance with paragraph (c) of this section; or
    (ii) Has in effect a program that achieves secondary removal 
equivalency in accordance with paragraph (d) of this section.
    (2) Each applicant shall demonstrate that industrial sources 
introducing waste into the applicant's treatment works are in compliance 
with all applicable pretreatment requirements, including numerical 
standards set by local limits, and that it will enforce those 
requirements.
    (c) Applicable pretreatment requirement. (1) An applicable 
pretreatment requirement under paragraph (b)(1)(i) of this section with 
respect to a toxic pollutant shall consist of the following:
    (i) As to a toxic pollutant introduced into the applicant's 
treatment works by an industrial discharger for which there is no 
applicable categorical pretreatment standard for the toxic pollutant, a 
local limit or limits on the toxic pollutant as necessary to satisfy the 
requirements of 40 CFR part 403; and
    (ii) As to a toxic pollutant introduced into the applicant's 
treatment works by an industrial discharger that is subject to a 
categorical pretreatment standard for the toxic pollutant, the 
categorical standard and a local limit or limits as necessary to satisfy 
the requirements of 40 CFR part 403;
    (iii) As to a toxic pollutant introduced into the applicant's 
treatment works by an industrial discharger for which there is no 
applicable categorical pretreatment standard for the toxic pollutant, 
and the 40 CFR part 403 analysis on the toxic pollutant shows that no 
local limit is necessary, the applicant shall demonstrate to EPA on an 
annual basis during the term of the permit through continued monitoring 
and appropriate technical review that a local limit is not necessary, 
and, where appropriate, require industrial management practices plans 
and other pollution prevention activities to reduce or control the 
discharge of each such pollutant by industrial dischargers to the POTW. 
If such monitoring and technical review of data indicate that a local 
limit is needed, the POTW shall establish and implement a local limit.
    (2) Any local limits developed to meet the requirements of 
paragraphs (b)(1)(i) and (c)(1) of this section shall be:
    (i) Consistent with all applicable requirements of 40 CFR part 403 
and
    (ii) Subject to approval by the Administrator as part of the 301(h) 
application review. The Administrator may require such local limits to 
be revised as necessary to meet the requirements of this section or 40 
CFR part 403.
    (d) Secondary removal equivalency. An applicant shall demonstrate 
that it achieves secondary removal equivalency through the use of a 
secondary treatment pilot (demonstration) plant at the applicant's 
facility which provides an empirical determination of the amount of a 
toxic pollutant removed by the application of secondary treatment to the 
applicant's influent where the applicant's influent has not been 
pretreated. Alternatively, an applicant may make this determination 
using influent that has received industrial pretreatment, 
notwithstanding the definition of secondary removal equivalency in Sec.  
125.58(w). The NPDES permit shall include effluent limits based on the 
data from the secondary equivalency demonstration when those limits are 
more stringent than effluent limits based on State water quality 
standards or water quality criteria, if applicable, or are otherwise 
required to assure that all applicable environmental protection criteria 
are met.

[[Page 326]]

Once such effluent limits are established in the NPDES permit, the POTW 
may either establish local limits or perform additional treatment at the 
POTW or a combination of the two to achieve the permit limit.