40 CFR § 35.2035 - Rotating biological contractor (RBC) replacement grants.

---
identifier: "/us/cfr/t40/s35.2035"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 35.2035 - Rotating biological contractor (RBC) replacement grants."
title_number: 40
title_name: "Protection of Environment"
section_number: "35.2035"
section_name: "Rotating biological contractor (RBC) replacement grants."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "B"
subchapter_name: "GRANTS AND OTHER FEDERAL ASSISTANCE"
part_number: "35"
part_name: "STATE AND LOCAL ASSISTANCE"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401  33 U.S.C. 1251  42 U.S.C. 300f  42 U.S.C. 6901  7 U.S.C. 136  15 U.S.C. 2601  42 U.S.C. 13101  Pub. L. 104-134, 110 Stat. 1321, 1321-299 (1996); Pub. L. 105-65, 111 Stat. 1344, 1373 (1997), 2 CFR 200."
cfr_part: "35"
---


# 35.2035 Rotating biological contractor (RBC) replacement grants.

The Regional Administrator may award a grant for 100 percent of the cost, including planning and design costs, of modification or replacement of RBCs which have failed to meet design performance specifications, provided:

(a) The applicant for a modification/replacement grant demonstrates to the Regional Administrator's satisfaction, by a preponderance of the evidence, that the RBC failure is not due to the negligence of any person, including the treatment works owner, the applicant, its engineers, contractors, equipment manufacturers or suppliers;

(b) The RBC failure has significantly increased the project's capital or operation and maintenance costs;

(c) The modification/replacement project meets all requirements of EPA's construction grant and other applicable regulations, including 40 CFR part 35, and 2 CFR parts 200, 1500 and 1532.

(d) The modification/replacement project is included within the fundable range of the State's annual project priority list; and

(e) The State certifies the project for funding from its regular (*i.e.*, non-reserve) allotments and from funds appropriated or otherwise available after February 4, 1987.

[55 FR 27095, June 29, 1990, as amended at 79 FR 76056, Dec. 19, 2014]