49 C.F.R. § 192.625

Odorization of gas

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(a) A combustible gas in a distribution line must contain a natural odorant or be odorized so that at a concentration in air of one-fifth of the lower explosive limit, the gas is readily detectable by a person with a normal sense of smell.

(b) After December 31, 1976, a combustible gas in a transmission line in a Class 3 or Class 4 location must comply with the requirements of paragraph (a) of this section unless:

(1) At least 50 percent of the length of the line downstream from that location is in a Class 1 or Class 2 location;

(2) The line transports gas to any of the following facilities which received gas without an odorant from that line before May 5, 1975;

(i) An underground storage field;

(ii) A gas processing plant;

(iii) A gas dehydration plant; or

(iv) An industrial plant using gas in a process where the presence of an odorant:

(A) Makes the end product unfit for the purpose for which it is intended;

(B) Reduces the activity of a catalyst; or

(3) In the case of a lateral line which transports gas to a distribution center, at least 50 percent of the length of that line is in a Class 1 or Class 2 location; or

(4) The combustible gas is hydrogen intended for use as a feedstock in a manufacturing process.

(1) The odorant may not be deleterious to persons, materials, or pipe.

(2) The products of combustion from the odorant may not be toxic when breathed nor may they be corrosive or harmful to those materials to which the products of combustion will be exposed.

(d) The odorant may not be soluble in water to an extent greater than 2.5 parts to 100 parts by weight.

(e) Equipment for odorization must introduce the odorant without wide variations in the level of odorant.

(f) To assure the proper concentration of odorant in accordance with this section, each operator must conduct periodic sampling of combustible gases using an instrument capable of determining the percentage of gas in air at which the odor becomes readily detectable. Operators of master meter systems may comply with this requirement by—

(1) Receiving written verification from their gas source that the gas has the proper concentration of odorant; and

(2) Conducting periodic “sniff” tests at the extremities of the system to confirm that the gas contains odorant.

[35 FR 13257, Aug. 19, 1970] Editorial Note:For Federal Register citations affecting § 192.625, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.

Notes of Decisions

Cited in 6 cases (1 in the last 5 years), 1997–2026 · leading case: Reggie Elliott v. El Paso Corp., 181 So. 3d 263 (Miss. 2015).

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Reggie Elliott v. El Paso Corp., 181 So. 3d 263 (Miss. 2015). “” 49 C.F.R. § 192.625 (a). The plaintiffs point out that Congress required natural gas companies to add odorant to natural gas as the result of a 1937 school explosion in New London, Texas.”

Nat. Gas Odorizing, Inc. v. Downs, 685 N.E.2d 155 (Ind. Ct. App. 1997). “49 C.F.R. § 192.625 (a). 7 . Since the initiation of Downs' lawsuit, the Indiana Product Liability Act has been amended substantially by P.”

Huitt v. S. California Gas Co., 188 Cal. App. 4th 1586 (Cal. Ct. App. 2010). “( 49 C.F.R. § 192.625 (a) (2010).) The evidence established that the odorant added to natural gas is adsorbed by new steel gas pipes until the pipes become seasoned (or saturated).”

Hynes v. Energy West, Inc., 211 F.3d 1193 (10th Cir. 2000). “703 and that the improper odorization violated 49 C.F.R. § 192.625 . Although the *1197 wording of the Complaint suggests that the Hynes intended to proceed on a theory of negligence per se based on these regulatory violations, the PreTrial Order evidently amended the Complaint…”

Carla Miller v. Indiana Gas Co., Inc (Ind. Ct. App. 2026). · cites it 3× “Because of this, federal regulation 49 C.F.R. § 192.625 (a) states Court of Appeals of Indiana | Opinion 25A-CT-866 | February 20, 2026 Page 3 of 23 that “a combustible gas in a distribution line must contain a natural odorant or be odorized so that at a concentration in air of…”

Kating v. ONEOK Inc., 953 P.2d 66 (Okla. Civ. App. 1997). “…review on the trial court record under Rule 1.36, Oklahoma Supreme Court Rules, 12 O.S.Supp.1997, Ch. 15, App. . See 49 C.F.R. § 192.625 .”

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