Who pays for the sewer lateral in Irvine Ranch Water District, CA

WHAT KIND OF HOME YOU LIVE IN DECIDES THE ANSWER. Section 4.15.2 of the District's Rules is headed "Sewer - Single Family Units"; section 4.15.3, "Sewer - Multi-Dwelling Units (Condominium Complexes and Townhomes)", reverses it. There, "maintenance of onsite sewer main lines shall be the responsibility of the District up to the main line cleanout or last manhole", and "all laterals upstream of the main line are the responsibility of the applicant, owner or customer to maintain, repair, or reconstruct" - so a condominium owner rebuilds their own lateral where a house owner does not, and the District's share begins at a cleanout rather than at a property line. Even that much is conditional: those onsite mains qualify only where the facilities "must be fully dedicated to the District, including proper easements, and approved by the Manager or his designee". A commercial or industrial property under 4.15.4 falls on whichever side its plumbing does - one lateral connection and it is read like a house, an onsite collection system and it is read like a condominium. AND FOR A HOUSE, the property line divides who REBUILDS the pipe and does not divide who clears it. That distinction is not on the District's public page and it is in its Rules, so it is the thing most likely to surprise an Irvine owner with a blockage under the road. Rules and Regulations section 4.15.2, for single family units, provides that "the applicant, owner, or customer is responsible for maintenance of the upper lateral and lower lateral" and that "any upper lateral or lower lateral shall be cleared and cleaned by the applicant, owner, or customer at his own expense" - then splits the heavier work, with "the upper lateral ... the responsibility of the owner to repair or reconstruct" and "the lower lateral ... the responsibility of the District to repair or reconstruct". So a collapsed pipe beyond your boundary is the District's to rebuild and a blocked one is yours to rod, and the page that says the District owns and maintains the pipelines does not tell you the second half. The section opens "unless otherwise specified on an approved IRWD Construction plan", so a newer development may differ. Beyond that, nothing conditions the property line itself - in several other districts the authority's half does not begin until there is an accessible cleanout, and here it begins anyway. Two practical notes from the District: do not plant trees or shrubs near the lateral, "because root intrusion can damage lines", and perform periodic cleaning and inspection of your own upper lateral. Note also that IRWD serves all of Irvine but only parts of Lake Forest, Newport Beach, Tustin, Costa Mesa and Orange, so an address in one of those towns needs its provider confirmed before this answer is relied on.