Low water pressure can result from a partly closed shutoff valve, clogged faucet aerator, leak, mineral buildup or a supply-system issue. First note whether pressure is low at one fixture or throughout the property. If only one faucet is affected, the cause may be local to that fixture. If several fixtures are affected, the issue may be more widespread. Sudden pressure changes, discolored water or visible leaks deserve attention. Do not adjust pressure regulators or plumbing components unless you understand the system. Record when the problem occurs and whether hot and cold water are both affected. For water line and pressure-related service inquiries, call +1 (866) 569-0263 and provide your ZIP code and symptoms.