Utah Administrative Code

The Utah Administrative Code is the body of all effective administrative rules as compiled and organized by the Division of Administrative Rules (see Subsection 63G-3-102(5); see also Sections 63G-3-701 and 702).

NOTE: For a list of rules that have been made effective since January 1, 2020, please see the codification segue page.

NOTE TO RULEFILING AGENCIES: Use the RTF version for submitting rule changes.

R307. Environmental Quality, Air Quality.

Rule R307-510. Oil and Gas Industry: Natural Gas Engine Requirements.

As in effect on January 1, 2020

Table of Contents

R307-510-1. Purpose.

R307-510 establishes control requirements for stationary engines associated with well sites.

R307-510-2. Definitions.

"Site hp" means the total horse power rating of all engines within the boundaries of the source.

R307-510-3. Applicability.

(1) R307-510 applies to each natural gas-fired engine at a well site as defined in 40 CFR 60.5430a, Subpart OOOOa Standards of Performance for Crude Oil and Natural Gas Production, Transmission and Distribution, that began operations, installed new engines, or made modifications to existing engines after January 1, 2016.

(2) R307-510 shall apply to centralized tank batteries, as defined in R307-506-2.

(3) R307-510 does not apply to a natural gas-fired engine that is subject to an approval order issued under R307-401-8.

R307-510-4. Engine Requirements.

(1) Regardless of construction, reconstruction, or modification date, each stationary engine at a well site shall comply with the emission standards listed in Table 1 when the engine is installed, relocated, or modified.

                                                    Table 1

Maximum Engine hp             Emission Standards in (g/hp-hr)

                              NOx      CO    VOC    HC+NOx
Equal or greater than          -      4.85    -      2.83
25 hp and < 100 hp
Equal or greater than         1.0     2.0    0.7      -
100 hp

(2) The owner or operator shall either:

(a) purchase a certified stationary internal combustion engine as defined in 40 CFR 60.4248, or

(b) conduct an initial performance test according to 40 CFR 60.4244.

(3) Each engine shall vent exhaust gases vertically unrestricted with the following stack height requirements:

(a) For site hp ratings of 306 or greater, each engine shall have an attached stack height of no less than 10 feet.

(b) For site hp ratings of 151 to 305 hp, each engine shall have an attached stack height of no less than 8 feet.

(c) For site hp ratings of 150 hp or less, there are no stack height requirements on engines.

R307-510-5. Recordkeeping.

For each engine on site, the owner or operator shall maintain records of the engine certification or initial performance test for the period of time the engine is on the well site.


air pollution, oil, gas

Date of Enactment or Last Substantive Amendment

March 5, 2018

Authorizing, Implemented, or Interpreted Law


Additional Information


For questions regarding the content or application of rules under Title R307, please contact the promulgating agency (Environmental Quality, Air Quality). A list of agencies with links to their homepages is available at http://www.utah.gov/government/agencylist.html or from http://www.rules.utah.gov/contact/agencycontacts.htm.