HydroShield Backflow Testing and Repairs Certified backflow prevention specialists serving residential and commercial properties across Northern California. We provide professional backflow testing, fireline inspections, repairs, and installation​/​replacements with full compliance reporting submitted directly to your water authority. Our services are affordable, reliable, and backed by years of hands-on experience. Whether you need a one-time test, annual compliance, or emergency repair, HydroShield ensures your property stays protected, compliant, and worry-free. Licensed, insured, and committed to high-quality service.