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Sprinkler Backflow Preventers: Legal Requirement & Health Protection

A lush lawn reflects homeowner care. But every sprinkler system needs a dedicated backflow preventer—most states require it by law for new installations.

What Is Backflow?

Clean water passes main valve → control valve → sprinkler pipes. Backflow reverses this, pulling contaminated water into potable supply. Two mechanisms:

  • Back-siphonage: Main pressure loss draws water backward to equilibrate
  • Back-pressure: Faulty/low control valve installation (must be 6+ inches above highest head)

Why Prevention Is Mandatory

Post-valve water contains soil particles, pesticides, fertilizers. If it re-enters drinking supply, it endangers your household and neighbors. Illegal to operate without approved preventer—blocks home sale if unpermitted.

Anti-Siphon Valves Aren't Enough

They only stop back-pressure, not back-siphonage. A dedicated preventer handles both. Don't substitute.

Protect your water, your liability, and your property value. Install the right preventer.

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