Board asks state to consider rule change allowing RV holding tanks on undersized lots

The Mason County Board of Health voted to send a letter to the State Board of Health asking the state to consider rule changes that would explicitly allow an RV holding-tank option for undersized lots where a conventional septic system or sewer connection is not feasible. Board staff described the holding tank as an in-ground storage tank with alarms that is pumped on a schedule; the format is intended to prevent on-site discharge when there is no reserve area for a conventional drain field. "There's no public health reason to not allow these to be installed on small lots," said Ian, explaining the county's request that the state consider a clear regulatory pathway so property owners and designers have consistent rules across jurisdictions. Staff and board members explained that the current state interpretation of on-site sewage rules constrains waivers on undersized lots, leaving some small shoreline and historic lots unable to use sewer or conventional systems. The request asks for consideration in the next rulemaking cycle of a narrowly drawn allowance for RV holding tanks that meet specified design and maintenance conditions; the board approved sending the letter and agreed to sign it. During discussion, staff noted practical details: holding tanks typically are storage tanks (staff cited an example size of roughly 1,200 gallons) that are pumped periodically and may have alarm and maintenance requirements; pumping costs were discussed as variable, and board members noted those recurring costs. The board instructed staff to print and circulate the letter and to collect signatures from members so it carries weight when submitted to the State Board of Health.