underground injection
Defined in 1 dictionary — U.S. Code
United States Code
42 U.S.C. § 300H — for purposes of this part (7 versions over time)
The term “underground injection”—
(A) means the subsurface emplacement of fluids by well injection; and
(B) excludes—
(i) the underground injection of natural gas for purposes of storage; and
(ii) the underground injection of fluids or propping agents (other than diesel fuels) pursuant to hydraulic fracturing operations related to oil, gas, or geothermal production activities.