Cal. Health & Safety Code § 25159.15

(a) Notwithstanding any other provision of law, on or after January 1, 1986, a person shall not discharge hazardous waste into an injection well which commences operation on or after January 1, 1986, and after January 1, 1988, a person shall not discharge hazardous waste into an injection well which commenced operation before January 1, 1986, unless all of the following conditions are met:
1. (1) Unless granted an exemption pursuant to subdivision (b), no point along the length of the injection well, as measured either horizontally or vertically, is located within one-half mile of drinking water.
2. (2) The person has received a hazardous waste facilities permit for the well issued pursuant to Section 25200.6.
3. (3) The injection well does not discharge hazardous waste into or above a formation which contains a source of drinking water within one-half mile of the well.
(b) A person may apply to the department to exempt an injection well from paragraph (1) of subdivision (a) if the person has received a hazardous waste facilities permit and the person has filed a report pursuant to Section 25159.18 with the department on or before January 1, 1987, which has been approved by the department, pursuant to Section 25159.18. If the person proposes to commence operation of an injection well on or after January 1, 1986, the person shall file the request for an exemption and the report at least one year before any proposed discharge or injection.
(c) The department shall either grant or deny an exemption from paragraph (1) of subdivision (a) on or before December 31, 1987, or within one year after receipt of the application for a proposed injection well. The department may grant an exemption from paragraph (1) of subdivision (a) only if the department makes all of the following written findings, and supports these findings by citing specific evidence presented in the report or provided to the department:
1. (1) The hydrogeology report prepared pursuant to Section 25159.18 is current, accurate, and complete.
2. (2) No hazardous waste constituents have migrated from that portion of the injection well located above the injection zone or have migrated from the injection zone.
3. (3) Practical alternative technologies, other than well injection, do not exist to reduce, treat, or dispose of the hazardous wastes which are to be discharged.
4. (4) Continuing or commencing the operation of the injection well does not pose a potential of hazardous waste constituents migrating from that portion of the injection well located above the injection zone or migrating from the injection zone and a monitoring program pursuant to subdivision (c) of Section 25159.17 has been installed, or for a proposed injection well, the monitoring program has been designed and will be installed before any discharge or injections into the well.
(d) An exemption granted pursuant to subdivision (c) shall not be effective for more than five years. Applications for an exemption, or a renewal of an exemption, shall be accompanied by the fee specified in the fee schedules adopted by the department pursuant to Section 25159.19. The department shall not renew the exemption unless it makes all of the findings in subdivision (c).
(e) The department shall revoke an exemption granted pursuant to subdivision (c) if the department determines that there is migration of hazardous wastes, or a threat of migration of hazardous wastes, from the well into any strata or the waters of the state outside the injection zone. The department shall then prohibit the discharge of any hazardous waste into the injection well, require appropriate removal and remedial actions by the person granted the exemption, and require the responsible parties to take appropriate removal and remedial actions.
(f) The state board, the regional boards, and the department shall establish procedures providing for the interagency transfer and review of applications for exemption received pursuant to subdivision (b).
(g) This section applies only to injection wells into which hazardous waste is discharged.