The hard water here is no secret; the 2025 report puts it at between 10 and 17.6 grains per gallon. Those minerals can leave scale in your drainage and fixtures that mixes in with food particles and grease. Then there is the matter of caliche. Found in much of southern Arizona, this calcium-carbonate can create a cement-like barrier underground that complicates excavation or repair work on an interceptor. Add in a monsoon downpour, and you may find stormwater intrusion or poor grading around the site. Our technicians know to look for these things before they put forward a recommendation.