---
kind: "section"
citation: "40 C.F.R. § 136.1"
title: "40"
number: "136.1"
heading: "Applicability."
url: "https://uscodex.org/cfr/40/136.1"
---

# §136.1. Applicability.

- (a) The procedures prescribed herein shall, except as noted in §§ [136.4](/cfr/40/136.4.md), [136.5](/cfr/40/136.5.md), and [136.6](/cfr/40/136.6.md), be used to perform the measurements indicated whenever the waste constituent specified is required to be measured for:
  - (1) An application submitted to the Director and/or reports required to be submitted under NPDES permits or other requests for quantitative or qualitative effluent data under parts [122](/cfr/40/part122.md) through [125](/cfr/40/part125.md) of this chapter; and
  - (2) Reports required to be submitted by dischargers under the NPDES established by parts [124](/cfr/40/part124.md) and [125](/cfr/40/part125.md) of this chapter; and
  - (3) **Certifications issued by States pursuant to section 401 of the Clean Water Act (CWA), as amended.**
- (b) The procedure prescribed herein and in [part 503 of title 40](/cfr/40/part503.md) shall be used to perform the measurements required for an application submitted to the Administrator or to a State for a sewage sludge permit under section 405(f) of the Clean Water Act and for recordkeeping and reporting requirements under [part 503 of title 40](/cfr/40/part503.md).
- (c) For the purposes of the NPDES program, when more than one test procedure is approved under this part for the analysis of a pollutant or pollutant parameter, the test procedure must be sufficiently sensitive as defined at 40 CFR [122.21(e)(3)](/cfr/40/122.21.md?p=e-3) and [122.44(i)(1)(iv)](/cfr/40/122.44.md?p=i-1-iv).

## Notes

### Amendments

[72 FR 14224, Mar. 26, 2007, as amended at 77 FR 29771, May 18, 2012; 79 FR 49013, Aug. 19, 2014; 82 FR 40846, Aug. 28, 2017]

### Authority

Authority: Secs. 301, 304(h), 307 and 501(a), Pub. L. 95-217, 91 Stat. 1566, et seq. (33 U.S.C. 1251, et seq. ) (the Federal Water Pollution Control Act Amendments of 1972 as amended by the Clean Water Act of 1977).

### Amendments

[72 FR 14224, Mar. 26, 2007, as amended at 77 FR 29771, May 18, 2012; 79 FR 49013, Aug. 19, 2014; 82 FR 40846, Aug. 28, 2017]