How Often Should Backflow Preventers Be Inspected or Tested?
Backflow preventers should be tested annually by a certified backflow assembly tester. This is a Washington and Idaho state requirement on virtually…
Read AnswerFrequently Asked Questions
Straight answers to the questions our customers ask most — covering plumbing, heating, cooling, and electrical service across our service area.
Is Backflow Prevention Required by Law in Spokane Valley?
Yes — backflow prevention is required by law in Spokane Valley and across most of Washington and Idaho. Lawn irrigation systems, fire…
Read AnswerHow Do I Know If My Backflow Preventer Is Working Properly?
You’ll know your backflow preventer is working properly if it passes an annual certified test, doesn’t drip from the relief valve, and…
Read AnswerWhat Is a Backflow Preventer and Why Do I Need One in My Home?
A backflow preventer is a one-way valve assembly installed on a water line to keep contaminated water from flowing back into your…
Read AnswerWhat Sets Mainstream Apart From Other Commercial Plumbing Contractors in the Spokane Valley Area?
What sets Mainstream apart in Spokane Valley commercial plumbing is single-roof capability: licensed plumbers, electricians, HVAC techs, and excavation crews under one…
Read AnswerCan a General Contractor Handle All Aspects of a Bathroom Renovation Including Plumbing?
A general contractor can coordinate every aspect of a bathroom renovation, but the actual plumbing work — water lines, drains, vents, fixtures,…
Read AnswerWhat Qualifications Should I Look for When Hiring a Plumbing Contractor?
When hiring a plumbing contractor, look for a current state license, liability insurance, workers’ comp coverage, verifiable local references, transparent flat-rate pricing,…
Read AnswerWhat Are Some Common Signs That I Need to Call a Plumbing Contractor for Repairs?
Common signs you should call a plumbing contractor are recurring drain clogs, low water pressure, visible leaks, jumps in your water bill,…
Read AnswerCan Mainstream Install a Pressure Pump in My Home?
Yes — Mainstream installs whole-home water pressure booster pumps for homes with chronically low pressure. Our licensed plumbers size and install systems…
Read AnswerHow Does a High Pressure Water Pump Work?
A high-pressure water pump works by using a motor-driven impeller to add energy to the water as it passes through, raising its…
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