California Code of Regulations
Title 14 - Natural Resources
Division 1.5 - Department of Forestry and Fire Protection
Chapter 4 - Forest Practices
Subchapter 5 - Northern Forest District Rules
Article 6 - Watercourse and Lake Protection
Section 936.10 - Domestic Water Supply Protection

(a) When proposed Timber Operations may threaten to degrade a domestic water supply the Director shall evaluate any mitigations recommended prior to the close of the public comment period (PRC § 4582.7) and shall require the adoption of those practices which are Feasible and necessary to protect the quality and Beneficial Use of the supply.

(b) The Director may require a post-harvest evaluation of the effectiveness of the mitigations and practices designed to protect the domestic water supply as a condition of Plan approval. The Director shall require an evaluation at the request of the California Regional Water Quality Control Board, or any affected water purveyor, if the necessity for the evaluation is supported by substantial evidence in the record. This evidence may include, but is not limited to, potential land failures, accelerated rate of road construction or harvesting within a watershed, Concentration or intensity of harvesting activity near Streams or springs. The design and implementation of the evaluation shall be done in consultation with the Director, appropriate RWQCB, and THP submitter, and the sufficiency of the information requested by the Director shall be judged in light of reasonableness and practicality.