Water and Sewer Backup Insurance Claim Denials in Colorado

Water damage from sewer or drain backups can be disruptive and expensive, especially when an insurance claim is denied. Homeowners and HOAs across Colorado are often surprised to learn that water damage is not always treated the same way under an insurance policy, even when the damage is sudden and significant. Denials often cite exclusions, maintenance issues, or policy language that feels unclear. In many cases, a denial is not the final answer, particularly when questions arise about how the claim was handled. Learn more about why insurance companies often deny water and sewer backup claims and how our Colorado Insurance Claim Denial Attorneys can help you.

The insurance industry has a complicated business structure. It goes something like this: Most policies start with the coverage grant, which provides broad coverage for any sudden and accidental damage. However, a series of specifically identified exclusions follows, excluding certain types of damage and/or causes of damage. Finally, in some cases, either by the policyholder’s choice or government regulation, certain excluded coverages are brought back within the policy through endorsements.  In the case of water damage, this convoluted system often means that some damage from water is covered and other types are not. This dynamic is evident in water that backs up through sewers, drains, or sump pumps. While damage from a burst pipe or appliance failure may be covered, water that enters a home through a sewer or drain line is often excluded unless the policy includes a specific endorsement.

Insurers may rely on narrow definitions, exclusions, or factual disputes about the source of the water to justify a denial. These issues can be difficult for policyholders to challenge without understanding how coverage is supposed to work.

Policyholders frequently see the same explanations appear in denial letters, including:

• Sewer or drain backups are excluded unless optional coverage was purchased

• The damage resulted from wear and tear, deterioration, or lack of maintenance

• The event was not sudden or accidental

• The water originated outside the covered structure

• The insurer claims the source of the water cannot be verified

Each of these reasons may sound definitive, but in practice, they often depend on how thoroughly the insurer investigated the loss and on how the policy language is applied.

Sewer backup coverage is typically offered as an optional endorsement as standard homeowner policies exclude damage from backup. When added, it may come with separate limits that are significantly lower than the policy’s overall dwelling coverage. These limits can apply to damage caused by sewer line blockages, drain backups, or sump pump failures.

Many homeowners wrongly trust that any water-related damage will be covered under their policy. Disputes commonly occur when a claim involves mixed causes, such as a plumbing failure combined with a blocked sewer line. 

When a Denial May Cross Into Insurance Bad Faith

Not every denied claim is wrongful. Insurance bad faith focuses on how the insurer handled the claim, not simply whether coverage was ultimately owed. Under Colorado law, insurers are required to investigate claims reasonably and avoid unreasonable delay or denial of benefits owed under a policy.

A denial may raise bad faith concerns when an insurer:

• Fails to conduct a thorough investigation into the source of the water damage

• Ignores evidence that supports coverage

• Applies exclusions improperly or out of context

• Delays the claim without a reasonable explanation

• Undervalues repairs without adequate support

When these issues arise, a denied water or sewer backup claim often warrants a legal review—especially if the dispute is tied to larger property or ownership issues that require real estate litigation to resolve.

Water and sewer backup claims involving HOAs or condominiums are often more complex. Responsibility may depend on whether the damage originated in a common area, a shared line, or within an individual unit. Disputes frequently arise between the HOA’s master policy and the unit owner’s personal policy.

Insurers may deny claims by shifting responsibility between the HOA and the homeowner, leaving repairs unresolved. Understanding how governing documents and insurance policies interact is an important step in determining whether a denial is proper.

After a denial, homeowners and HOAs should take several practical steps:

1. Review the denial letter and the policy provisions cited.

2. Try to communicate in writing at all times. If your communication must be in person or over the phone, memorialize those conversations in an email or letter to the carrier.

3. Request a certified copy of the policy.  In Colorado, insurers are required by law to provide a certified copy of the policy within 30 days. CRS 10-4-110.8(10)

4. Request a complete copy of the claim file, including adjuster notes. (Note: Often, insurers will refuse to provide the claim file and claim notes, but it’s a good practice to request them. If there’s nothing to hide, why not give that information to the policyholder?)

5. Document the damage, repairs, and related expenses with receipts or contractor estimates, and provide them to the carrier.

6. Pay attention to appeal deadlines and notice requirements.

7. Consider whether the denial or delay appears unreasonable under the circumstances.

Thorough documentation is especially important. You may find it helpful to review Robinson & Henry’s guide on documenting damage for home insurance claims before appealing a denial or requesting reconsideration.

If an insurance denial doesn't match the facts of your case or the language in your policy, it’s time for a legal review. A lawyer experienced in insurance claim denials can check if the insurer properly investigated your claim and if they’re causing unnecessary delay. In Colorado, you may be entitled to additional compensation if the insurance company broke the law.  

If you are dealing with a denied water or sewer backup insurance claim, understanding your options can help you decide how to move forward.

Robinson & Henry represents Colorado homeowners, condo owners, and HOAs in disputes involving denied or delayed water and sewer backup insurance claims. Our attorneys understand how Colorado insurance law intersects with real estate ownership, HOA governing documents, and insurance bad faith standards.

We review denial letters, policy language, claim handling practices, and supporting documentation to determine whether an insurer acted reasonably and in compliance with Colorado law. When appropriate, we help clients pursue appeals, negotiate with insurers, or take legal action to protect their rights.

If you are dealing with a denied water or sewer backup insurance claim, schedule a consultation online or call 303-688-0944.