Why is there no standard jetting interval for an apartment main?
Every complex has a different mix of pipe age, pipe material, slope, number of units, landscaping and tenant habits, and each of those changes how fast a line builds up. The EPA's guide for evaluating sewer maintenance programs puts it plainly: sewers vary widely in their need for preventive cleaning. Its examples show the spread. A collection system in a restaurant district may require cleaning every six months to prevent grease blockages, while an area with new PVC piping, no significant grease contribution and reasonable, consistent slopes may be able to go five years with no problems.
Those examples describe public sewer systems, not a single apartment property, so treat them as a picture of how wide the range is rather than a number to copy. The point for a property manager is the same one the EPA makes to cities: the right interval is the one your own line's history supports.
What records should set the schedule?
The EPA calls accurate recordkeeping the backbone of an effective sewer cleaning program, because it shows which parts of a system are prone to stoppages so each part can be put on an appropriate schedule. Its guide lists what a cleaning record should capture, and the same list works for a complex:
- The date, time and location of each stoppage or routine cleaning, down to the building or cleanout.
- The cleaning method used, such as snaking or jetting.
- The cause of the stoppage, if it was found (grease, wipes, roots, a sag in the line).
- Who did the work.
- Further actions recommended or started, such as a camera inspection or a repair.
- Weather conditions at the time.
How do camera findings change how often the line is jetted?
The EPA's sewer cleaning and inspection fact sheet says inspection programs are needed to determine current sewer conditions and to plan a maintenance strategy, and that a camera inspection produces a video record for future reference. For an apartment main, that video is the baseline every later decision is measured against.
What the camera shows points to different answers. The EPA notes that stoppages in gravity sewers are usually caused by a structural defect, poor design, poor construction, an accumulation of material in the pipe (especially grease), or root intrusion. Grease and roots are buildup problems that a cleaning schedule can manage. A broken pipe, an offset joint or a low spot that holds water is a condition that keeps catching debris, and jetting it more often only treats the symptom. The sewer camera inspection page explains what a camera can and cannot show and why a line sometimes needs cleaning before the video is useful.
- Heavy grease coating the pipe walls between cleanings: the interval is probably too long, and the source of the grease is worth tracking down.
- Root intrusion at joints: roots come back, so the schedule should follow how fast they regrow on the next video.
- A clean, round pipe at the next scheduled visit: the interval may be longer than it needs to be.
- A sag, break or offset: plan the repair rather than relying on more frequent cleaning.
Where do apartment sewer problems usually come from?
The EPA's fact sheet cites a finding that 80 percent of problems occur in 25 percent of the system. On a complex, that often means one building, one kitchen stack or one stretch of main causes most of the calls. Cleaning that section on a tighter schedule while leaving clean sections alone is how the EPA's case studies describe putting maintenance where the history says it is needed. Fairfax County, Virginia, for example, scheduled sewer cleanings based on maintenance history and used the records it kept to re-prioritize which lines to clean and how often.
Tenant habits drive much of the buildup. The City of Phoenix lists apartment buildings and condominiums among the places that produce fats, oils and grease, and says this grease solidifies and sticks to sewer pipe walls, restricting or completely blocking pipes. The City of Chandler notes that home garbage disposals do not keep grease out of the wastewater pipes and in fact contribute to the problem. The City of Mesa adds that so-called flushable wipes take at least six hours to disintegrate, if at all, compared with one to four minutes for toilet paper.
Regular tenant reminders are a low-effort way to slow the buildup between cleanings:
- Let cooking grease cool, then put it in a can or jar and throw it in the trash, as Chandler and Mesa advise.
- Scrape plates into the trash before rinsing, and go easy on the garbage disposal.
- Flush only toilet paper. Mesa's list of items not to flush includes wipes, dental floss, paper towels, cotton swabs and personal hygiene products.
Which part of the sewer is the property's responsibility?
The schedule only covers the pipes the property owns. The City of Phoenix says its property owners are responsible for maintaining and repairing the sewer and water lines that run through their property and connect to the city's main lines. Chandler explains that when a blockage is reported, a city crew determines whether it is on the private property or city property, and that a blockage on private property is the owner's to have repaired by a plumber. Other cities set their own rules, so check with your city's utility for the exact point where the property's line ends.
How do you put the jetting schedule into practice?
Start with a camera inspection and a cleaning to establish where the main stands today, then set a first interval from what the video shows and the stoppage history. At each scheduled visit, look again. If the line is collecting grease or roots faster than expected, shorten the interval; if it is still clean, lengthen it. Keep the restaurant-style grease interceptor question separate: if the property has a commercial kitchen, its interceptor pump-outs follow city rules that the grease interceptor guide covers. The commercial jetting and commercial plumbing maintenance pages describe how recurring jetting fits into a broader property plan.
Common questions
Is jetting safe for an older apartment sewer main?
It depends on the pipe's condition. The EPA notes that backups into residences have been known to occur when high-velocity cleaning is used by inexperienced operators, so a camera look at a damaged or fragile line before high-pressure cleaning is a sensible first step.
Should the line be inspected with a camera every time it is jetted?
Not necessarily, but inspections are what tell you whether the interval is right. The EPA's fact sheet describes a city that recommended 70 inspections and maintenance activities for every 30 cleanings, because inspections help define and prevent future problems.
Our complex has no backups. Does the main need jetting at all?
A line with no stoppages may simply have a long safe interval. A baseline camera inspection shows whether buildup is forming before it causes a backup, and the video gives you a record to compare against on later visits.
Who pays when the backup is in the city's sewer instead of ours?
In Chandler, the city says it will fix a blockage found on city property, while a blockage on private property is the owner's responsibility. Other cities set their own rules, so check with your city utility.
Sources
- U.S. EPA: Guide for Evaluating CMOM Programs at Sanitary Sewer Collection Systems
- U.S. EPA Collection Systems O&M Fact Sheet: Sewer Cleaning and Inspection (EPA 832-F-99-031), hosted by MWRD
- City of Phoenix: Commercial Inspection and Fat, Oils, and Grease
- City of Phoenix: Water and Sewer Line Protection
- City of Chandler: Fats, Oils and Grease (FOG)
- City of Mesa: Safe Disposal of Fat, Oils and Grease (FOG) and Personal Items