Low, Ball & Lynch’s

WEEKLY LAW RESUME

January 27, 2005  Issue      By: Raymond Coates

Property Coverage - Exclusions - Sewer Backup

Penn-America Insurance Company v. Mike's Tailoring 

Court of Appeal, Third District

(January 11, 2026)

No California case has construed the standard exclusion in property insurance for water that backs up through a sewer or drain.  This case decided whether the exclusion applied to damage caused by pollutants.

Penn-America Insurance Company insured Mike's Tailoring under a property policy.  It excluded loss caused by water that backs up from a sewer or drain.

A sewer pipe serviced Mike's premises and an adjacent property and ran beneath the concrete floor of Mike's basement.  The pipe was connected to a cleanout pipe.  They were joined beneath Mike's basement floor, and the cleanout pipe ascended vertically at an angle until it entered the basement floor of Mike's premises.  Approximately 25 feet from the entrance, the pipe broke.  This allowed solid matter in the waste  water to collect at that point, resulting in a blockage.  Water and waste accumulated and came out of the pipe at the cleanout.  This flooded Mike's basement and damaged his property.

A trial court concluded the loss was covered because the sewer backup exclusion applied only to damage caused by water, not damage caused by pollutants carried by the water.  Penn-America appealed.

The Court of Appeal reversed.  The Court of Appeal found the exclusion to be unambiguous.  A lay person reading the policy would assume that the backup of water from a sewer would contain both water and contaminants.  The exclusion thus would apply to this loss.  The Court found no published California case on this point.  However, it noted that out-of-state cases supported their conclusion.

The Court found the efficient proximate cause analysis did not apply in this case.  That analysis only applies where a loss is caused by a combination of covered and excluded risks.  It does not apply where there is a loss resulting from a single cause.  In this case, the loss was caused by the backup of the sewer pipe.

The Court rejected arguments that the term "backup" was ambiguous.  It further rejected the argument that the exclusion did not apply if the blockage was within the insured premises.  This was based upon an argument that "sewer" refers to a public line and "plumbing" refers to a private line.  However, the Court noted that there was no language in the policy to support this argument.  There was no coverage provision in the policy that included damage from the discharge of water from a plumbing system.  Thus, this argument had no relevance.

The Court concluded the sewer backup exclusion excluded loss or damage caused by sewage and pollutants contained in the sewer water, and the loss was excluded from coverage.  The judgment was reversed.

COMMENT

This is a common exclusion which has received different treatment by various insurers.  This opinion should help clarify the approach to handling these claims.

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