10. In regulation 5 of the Private Water Supplies Regulations 2009(1)—
(a)re-number the current regulation 5 as regulation 5(1), and
(b)after paragraph (1) insert—
“(2) Where disinfection forms part of the preparation or distribution of water, the relevant person (as defined in section 80 of the Water Industry Act 1991) must—
(a)design, operate and maintain the disinfection process so as to keep disinfection by-products as low as possible without compromising the effectiveness of the disinfection,
(b)ensure that the effectiveness of the disinfection process is maintained,
(c)verify the effectiveness of the disinfection process, and
(3) For the purposes of this regulation, “disinfection” means a process of water treatment—
(a)to remove, or
(b)to render harmless to human health,
every pathogenic micro-organism and pathogenic parasite that would otherwise be present in the water.”.