"How often should I clean my drains?" is the second-most-common question we get after pricing. The honest answer is: it depends on the drain type, the home age, and how much usage the line gets. Here's the full breakdown.
Drain Cleaning Frequency Guide: Quick reference table
| Drain Type | Newer Home (post-1985) | Older Home (pre-1985) |
|---|---|---|
| Kitchen drain | Every 18-24 months | Every 12-18 months |
| Bathroom drains | Every 24-36 months | Every 18-24 months |
| Tub/shower drains | Every 24 months | Every 18 months |
| Main sewer line | Every 24-36 months | Every 18-24 months |
| Floor drains (basement, laundry) | Annually (run water) | Annually (run water) |
| Commercial grease trap | Every 30-90 days | Every 30-90 days |
Kitchen drains (most frequent)
Kitchen drains accumulate grease, food particles, and soap faster than any other drain. Even with good habits — scraping plates before rinsing, no grease down the sink — buildup is inevitable.
Why every 12-18 months in older homes: Pre-1985 Indianapolis homes typically have cast iron kitchen drains. The rough internal surface (compared to modern PVC) traps grease faster, requiring more frequent maintenance.
Cost: $175-$275 flat-rate. See kitchen drain cleaning.
Bathroom drains (less frequent)
Bathroom drains primarily handle water, hair, soap, and toothpaste. They accumulate buildup more slowly than kitchen lines but still benefit from periodic professional cleaning.
Heavy-use signal: If multiple people share one bathroom (especially with long hair), bump frequency up to 18 months even in newer homes.
Main sewer line (the important one)
The main sewer line carries every drop of wastewater from the house out to the city sewer. Annual or biennial cleaning prevents the kinds of blockages that cause basement backups.
Why 18-24 months for older Indianapolis homes: Clay tile sewer laterals + mature trees = predictable root pressure. Annual cleaning catches roots before they cause emergencies.
Indianapolis neighborhoods especially: Irvington, Crown Hill, Garfield Park, Meridian-Kessler, Nora, Fountain Square — all in the annual cleaning bracket.
Floor drains
Basement and laundry floor drains are most-often-forgotten and dry out, allowing sewer gas in. They don't really need "cleaning" frequently — they need water poured down them every few months to maintain the P-trap water seal.
Annual professional cleaning: Worth doing once a year because lint, sediment, and floor debris accumulate even with low use. Coordinate with main sewer cleaning visit.
Commercial grease traps
Restaurants and food-service operations have specific compliance requirements. Marion County FOG ordinance requires service when the grease layer reaches 25% of trap volume — which is generally every 30-90 days depending on volume.
See our detailed grease trap schedule guide.
Signs you should schedule sooner
Regardless of where you are in the maintenance cycle, schedule cleaning if:
- Drains are slower than they were 6 months ago
- You hear gurgling sounds from drains (see gurgling explained)
- Sewer smell anywhere in the house (see sewer smell causes)
- You've had multiple drains slow at once
- You're putting your home on the market (buyers often request a sewer scope)
- You're planning major landscaping that might disturb the lateral
Maintenance contracts vs ad-hoc
For older Indianapolis homes, we recommend a standing maintenance arrangement — annual or biennial sewer cleaning with optional kitchen cleaning, scheduled in advance. Predictable cost, no emergency surprises, line stays healthy.
No contract obligations. Just a recurring calendar event you can cancel any time.
For more detail, see our annual maintenance checklist with seasonal tasks for Indianapolis homeowners.