Property Insurance FundamentalsQuestion 158 of 474
A homeowner's 30-year-old galvanized water supply line gradually rusts through and slowly leaks behind a wall for several months, eventually causing $18,000 in mold and drywall damage. The HO-3 will most likely:
a.Pay the full $18,000 under the open-peril dwelling coverage
b.Pay only the cost of the replacement pipe section, since the HO-3 covers the wear-and-tear component of a plumbing loss but not the resulting water and mold damage
c.Deny the claim because the loss arises from wear and tear, rust, and gradual deterioration — all excluded
d.Pay the loss in full because the standard California HO-3 carries an automatic $50,000 mold remediation limit that applies no matter what caused the water
Explanation
Wear and tear, rust, corrosion, gradual deterioration, and resulting mold are EXCLUDED under the standard HO-3. Property insurance covers SUDDEN AND ACCIDENTAL events, not slow consequences of aging or owner neglect. A SUDDEN burst of the same pipe would be a different question and may be covered.
Law Reference: Standard HO/DP exclusionThis topic, taught in full in the Personal Lines Insurance Producer guide. Personal Lines Insurance Producer — Complete Study Guide (2026) — PDF + EPUB, $19.99 · 14-day refund →
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