In the Field · Part 4
Sewer and drain I: the camera, the locator, hydro-jetting vs. cabling, and when each is the right tool
A stoppage is the most common call a plumber gets and the one where the difference between a technician and a contractor shows: the technician clears it, the contractor finds out why and offers the customer the ladder. This lesson is the drain call as a method: the questions and the cheap tests before the machine comes off the truck, the choice between a cable and a jetter and what each one can and cannot do, when the camera goes in and how to read what it shows, how a locator turns a camera image into a spot on the driveway, and how to write up a drain call so that the $340 clearing leads honestly to the $9,000 lateral when that is what the pipe needs.
What the full lesson covers
- Before the machine: verify which fixtures are affected (one fixture, one branch, or the whole house tells you where the stoppage is), check the cleanouts, and look at the yard for the wet spot.
- A cable clears; it does not clean. It bores a hole through roots or grease and leaves the rest on the wall. A jetter cleans the full diameter with water at pressure and is the right tool for grease, scale, and soft roots, and the wrong tool for a broken clay line that will not hold water.
- The camera after clearing, not before: it shows the cause (roots, offset joints, a belly, a break, a collapsed section), and the locator puts the footage counter reading on the ground with a depth.
- The ladder on a drain call: clear (exempt from permit) / add a cleanout or repair a section (permit) / replace the line (permit, next lesson). Each with the camera footage as the evidence.
- On the service and repair form, the camera inspection is beyond the problem unless it is reasonably necessary to fix the stoppage or the customer asked; sell it honestly, and never describe on camera what is not there.
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More lessons in The Field: Method, Code, and Cases
- 1The diagnostic method: verify, isolate, cheapest test first, cause not symptom, the options ladder, document
- 2Permits: when one is required, what is exempt, pulling it online, the inspection sequence, what inspectors look for, and handling corrections
- 3Daily-use code: drainage slope, venting, water sizing, cleanouts, trap arms, and fixture units, with the section for each
- 4Gas piping in practice: sizing, CSST bonding, the pressure test, appliance connectors and shutoffs, sediment traps, and seismic shutoff valves
- 5Water heaters I: tank. Seismic strapping, the T&P discharge line, expansion tanks, sediment traps, pans, venting, and the garage rules
- 6Water heaters II: tankless and heat pump. Gas sizing, venting, condensate, the 2025 Energy Code direction, and where the gas-ban ordinances stand
- 7Sewer and drain I: the camera, the locator, hydro-jetting vs. cabling, and when each is the right toolYou are here
- 8Sewer and drain II: trenchless vs. open trench, whose lateral it is (it varies by city), backwater valves, and point-of-sale lateral ordinances
- 9Case: the hissing line. The meter test, the supply leak that fed the roots, the lateral to the city tap, and the contract and permit trail
- 10Leak detection: slab leaks, acoustic and pressure methods, thermal imaging, and repipe vs. reroute
- 11Low pressure: the PRV, galvanized pipe, and the sequence that finds which one it is
- 12Sewer gas: trap seals, trap primers, vents, and the sequence that finds the smell
- 13Water treatment: where softeners are restricted in California, filtration, pressure regulators, and thermal expansion
- 14Fixtures and conservation: CALGreen flow rates, SB 407 retrofit-on-alteration and disclosure-on-sale, 1.28 gpf, and the ADA basics a plumber needs
- 15Materials and methods: PEX vs. copper vs. CPVC, ABS vs. PVC (it is regional), cast iron, and the transitions that fail
- 16Commercial basics: grease interceptors, the backflow program, and the tester certification that opens a second line of work
- 17Cal/OSHA for a small shop: the IIPP every employer must have, heat illness prevention, trenching and the 5-foot permit, confined space, silica, and ladders
- 18Environmental rules: EPA lead-safe certification for any pre-1978 home, asbestos and transite pipe, and stormwater
- 19Job-site craft: sequencing with the other trades, protecting the home, and the punch list that ends the job
- 20Case: the water heater that failed inspection twice
- 21Case: the gas leak call. The protocol, and the walk-away
- 22Case: the "customer doesn't want a permit" job
- 23Template: the job-site checklist, from the truck to the walk-through
- 24Template: the pre-inspection checklist by stage. Underground, rough, water heater final, gas, and trim
- 25Template: the Injury and Illness Prevention Program starter for a plumbing shop of one to five
- 26Template: the Heat Illness Prevention Plan for a plumbing shop, outdoor and indoor
- 27Template: the customer options sheet (good / better / best) with the cost band, the permit path, and the code trail on each rung