A storm drainage system is a crucial feature of any commercial property or housing development. When properly maintained, it serves as a silent guardian, a watchful protector, quietly shielding property owners and the environment from the devasting effects of mismanaged stormwater. Only when these systems are left alone without inspection or maintenance, do property owners come to realize their importance.
To avoid experiencing this costly realization, property owners should schedule regular storm drain inspections. Annual storm drain inspections provide property owners with an accurate assessment of the current and long-term condition of their stormwater facilities. In Virginia, Maryland, and Washington, D.C., storm drain inspections also ensure compliance with local permit conditions in certain jurisdictions.
When these systems are neglected, issues often go unnoticed until costly damage occurs. Even minor drainage failures can escalate quickly, according to FEMA, just 1 inch of flooding can cause up to $25,000 in property damage, making routine storm drain inspections critical.
Storm Drain Inspection Quick Facts
- Recommended frequency: Annual inspections (or per local regulations)
- Purpose: Identify blockages, damage, and compliance issues
- Risk of neglect: Flooding, structural damage, costly repairs
- Applicable for: Commercial, residential, and industrial properties
Storm Drain Warning Signs at a Glance
| Warning Sign | What It Means | Risk Level |
| Standing water | Drain blockage or poor grading | High |
| Foul odor | Organic buildup or clog | Medium |
| Sinkholes | Pipe failure or leakage | High |
| Mold growth | Excess moisture intrusion | Medium |
There Are Several Reasons For Regular Inspection of Storm Drain Systems:
1. Foul Odors from Storm Drains
Suppose a strong odor is coming from your drainage system. In that case, this can be a tell-tale sign that there is a partial blockage needing to be cleared to allow for the free flow of water. When left untreated, water can back up and cause even more significant problems.
2. Building Movement or Foundation Issues
If your property is displaying signs of movement, this can be a sign that the foundations of the building are being undermined by water. A damaged drainage pipe can leak water and result in the ground underneath your building’s foundation softening, causing it to move.
Fixing foundational issues can be extremely costly, so it is vital to have storm drains inspected on a regular basis to ensure pipes are checked and repaired and any leaks are stopped sooner rather than later.
3. Purchasing a New Property
It is common knowledge that a building inspection should be carried out prior to purchasing a new property. Most buyers know to check for foundational damage, structural issues, and pest problems. However, the great majority of people probably never even give a second thought to what lies beneath their purchase.
If you are intending to purchase a building, only to learn that there are a multitude of damaged pipes and blockages needing to be replaced or relined, this could add thousands of dollars to your budget as well as months onto your occupancy calendar. A storm drain inspection could thus save a lot of time, money, and heartache.
4. Standing Water After Rainfall
Heavy weather events can result in pooling or puddles on parking lots and other impervious surfaces for a few hours after rainfall. When those puddles remain there for longer than that, then there may be an issue with your storm drains. One good way to check if a storm drain inspection may be required is to compare your own property with that of a neighboring property. If the puddles remain on your property long after they have cleared up on your neighbor’s, there could be a drainage issue.
5. Clogged Inlets and Reduced Flow
Debris can slowly build up in storm drains and over time become a serious problem that cuts down on the efficiency of your water flow if left unchecked. Reduced flow may even cause water to rise back up onto your property and neighboring properties resulting in property damage and structural issues.
6. Mold or Biological Growth
When water enters a building or property, mold will follow soon after. Mold growth can get into many different building materials after they are waterlogged. This can begin with an odor that starts after heavy rainfall and becomes a persistent issue over time, ending up with black mold growth that can spread throughout a property.
Proper storm drain maintenance can help to protect your property and even your health.
7. Sinkholes or Soil Movement
If a sinkhole is visibly forming beneath your parking lot, garage, or even a vegetated area, a leaking storm drain is one of the most likely causes. Seals around storm drain pipes can fail over time because of deterioration due to age or soil settlement. The result of this can be the formation of cracks or holes within underground pipes that cause water to escape underground and waterlog the soil underneath your property. Leaks that are not dealt with will result in more areas of your property sinking.
8. Displaced Mulch or Landscaping Materials
The likes of wood chips, mulch, and other media used as part of landscaping serve several different purposes, such as improving the soil condition, enhancing visual appeal, improving drainage, or controlling weeds. However, when mulch and media are displaced following rainfall, it’s often the result of drainage problems, specifically infiltration issues. When stormwater cannot adequately drain into the soil or through a green infrastructure or stormwater facility, the result is often flooded properties.
Protect Your Property with Professional Storm Drain Inspections
Not sure if your system needs inspection? Muller’s team can evaluate your storm drains, identify risks early, and recommend the right maintenance plan to keep your site compliant and operational.
Routine inspections help prevent flooding, reduce repair costs, and extend the life of your stormwater infrastructure.
Schedule a storm drain inspection with Muller today and keep your site protected, compliant, and performing at its best.
Frequently Asked Questions
Q: How Often Should Storm Drains Be Inspected?
Most properties should schedule a storm drain inspection at least once per year. Sites with heavy traffic, large impervious areas, or frequent storm events may need more frequent inspections to stay compliant and prevent system failures.
Q: What Does a Storm Drain Inspection Include?
A professional inspection evaluates inlet conditions, checks for debris buildup, tests system flow, and assesses pipe integrity. If issues are found, targeted cleaning or repairs may be recommended to restore proper performance.
Q: What Are the Risks of Skipping Storm Drain Maintenance?
Skipping maintenance can lead to blockages, flooding, and long-term infrastructure damage. It may also result in compliance issues depending on local regulations. Regular inspections and proactive upkeep help avoid costly repairs and downtime.
Q: What Should You Do If You Notice Drainage Issues?
If you notice standing water, odors, or reduced flow, it’s best to schedule an inspection right away. Early action can prevent larger failures. Learn more about long-term solutions with our stormwater maintenance services.
