Cal. Pub. Util. Code § 13578
The district may enter upon private property of any person and sample at, inspect or survey the waste water sampling installation or pretreatment facilities or processes of any contributor or discharger to ascertain whether district regulations for control of quantity, quality and flow of waste water are being complied with. Such inspections shall be made with the consent of the owner or possessor of such facilities or, if such consent is refused, with a warrant duly issued pursuant to the procedure set forth in Title 13 (commencing with Section 1822.50) of Part 3 of the Code of Civil Procedure. However, in the event of an emergency affecting the public health or safety, such inspection may be made without the consent or the issuance of a warrant. The district may terminate or cause to be terminated sewage disposal or water services to such property if a violation of any rule or regulation pertaining to control of waste water is found to exist or if a discharge of waste water causes or threatens to cause a condition of contamination, pollution or nuisance, as defined in this article.
Ca. Pub. Util. Code § 13578