Manhole Builders Inc.Corona, California
Sewer and storm drain manhole construction and precast manufacturing, one company, one name on both. The precast plants do not run construction crews and the underground contractors do not own a plant. We do both.
Concrete does not get a second try.
A base is poured once, in the ground, around live flows and existing pipe. You cannot take it back to the shop. We have channel forms for most sizes, or our crews can pour them freehand if needed, to the detail on the plan, with the inspector standing there.
Channel base, in the ground
Formed and finished around live flows, to the detail on the plan.
Flume manhole
An open channel formed through the structure, poured in place.
Storm drain structures
Headwalls, box culverts, and channels poured in place.
Also on the list: trapezoidal flumes, cast-in sluice gates, siphon manholes, 90 degree with inlet, pours into existing 30″ pipe. See the custom work.
The yard casts what the crews install.
Shafting from 36 to 120 inches inside diameter. Eccentric cones, flat tops, grade rings, risers, frames and covers stocked for Southern California districts. Portland type V cement at 4,000 PSI, manufactured to ASTM C-478.
Lined where the service demands it: Armorlok cast into the pour, or Utilithane, Raven and Warren sprayed on. Lined pieces are spark tested before they leave.
See the products
Septic · Advanced treatment
Off the sewer grid, still to standard.
We cast precast septic tanks in the same yard as the manholes, and we carry Norweco advanced treatment systems for parcels where the county requires more than a conventional tank can deliver.
Bring us the parcel and the county. We will tell you what passes.
Septic and Norweco
Protective coatings
Sewer gas eats concrete. We line it.
Utilithane polyurethane, Warren and Raven epoxy, and Armorlok PVC, cast into the pour or spray applied, in the yard or in the field. Every lined piece is spark tested before it goes into service.
Submittal drawings. We manufacture every piece on them.
Engineers pull our sheets for their submittal packages, and we have seen our own title blocks come back to us on agency plans. Browse the library free; request access once and pull what you need.
Browse the drawings
Family owned since the 1950s.
Simun Dzajkich started building manholes with his son-in-law in the 1950s. The fourth generation runs the company today and the fifth is estimating jobs. No parent company, no outside partners, which on a job means the person who answers the phone can make the call.
Five generations, one trade