Honolulu Cesspool Conversion in Diamond Head and Kāhala

Cesspool conversion in Diamond Head and Kāhala, Oʻahu. Free quotes from licensed local contractors for septic, ATU or sewer connection.

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Converting a cesspool in Diamond Head and Kāhala

If your home in Diamond Head and Kāhala still uses a cesspool, state law requires it to be upgraded, converted or connected to sewer by 2050. Many homeowners act sooner because of a home sale, a failing cesspool, or a renovation.

What to expect

  1. Tell us about your property using the form.
  2. A licensed local contractor reviews it, and usually a site and soil evaluation follows.
  3. An engineer designs the system and handles Department of Health approval.
  4. The new system is installed and the old cesspool is properly closed.

Typical costs run about $25,000 to $50,000. See cost and financing.

Sources: Hawaiʻi DOH; HPR, June 2026