Lift Station Construction JHA (Job Hazard Analysis / Activity Hazard Analysis)

Updated 2026-06-23

A Lift Station Construction JHA (Job Hazard Analysis / Activity Hazard Analysis) is the plan that keeps the crew building a sewage lift station from being buried in the deep excavation, overcome in the wet well as a confined space, or shocked by the pumps and electrical systems in the wet environment. Lift station construction builds the deep underground structures and pumping systems that lift sewage and stormwater — combining a deep excavation, a confined-space wet well with sewer atmosphere, and electrical work in wet conditions. This guide walks through building a Lift Station Construction JHA that names the deep-excavation, confined-space, and electrical hazards and assigns the protective-system, entry, and electrical controls that hold up in the field.

Why lift station construction needs its own JHA

A lift (pump) station lifts sewage or stormwater from a lower to a higher elevation where gravity flow is not possible, built as a deep wet well (the structure that holds the liquid and pumps) with pumps, piping, valves, and electrical controls. Construction involves a deep excavation for the wet well (often very deep), setting or constructing the structure, installing the pumps and piping, and the electrical and control systems. The hazards are serious and combined: the deep excavation can cave in, the wet well is a permit-required confined space (with sewer atmosphere — H2S, methane, oxygen deficiency — once it handles flow), and the electrical systems operate in the wet environment. Dewatering is often needed for the deep excavation. The deep excavation, the confined-space wet well, and the wet electrical work justify a dedicated JHA.

Breaking lift station construction into steps

The steps for a Lift Station Construction JHA follow the construction:

• Excavate deep for the wet well with protective systems and dewatering
• Set or construct the wet well structure
• Install pumps, piping, and valves
• Install electrical and control systems
• Enter the wet well for installation and connections (confined space)
• Test and commission the pumps and controls
• Manage atmospheric and electrical hazards
• Backfill and finish

Each step carries a hazard, and the deep excavation, the confined-space wet well, and the wet electrical work are where the most serious risks concentrate.

The hazards step by step

Deep excavation and cave-in

The wet well excavation is often very deep, with a serious cave-in hazard and the need for engineered protective systems, and groundwater requiring dewatering. The controls are engineered excavation protective systems (deep excavations often require engineered shoring/shielding designed by a registered professional engineer beyond the tabulated data), competent-person oversight, dewatering to control groundwater, safe access, and keeping the protective system in place. A deep lift station excavation is a high-consequence cave-in hazard. (These follow the excavation and dewatering fundamentals.)

Confined-space wet well

The wet well is a permit-required confined space — deep, with limited access, and once it handles sewage flow, holding the deadly sewer atmosphere (H2S, methane, oxygen deficiency). The controls are the full confined-space program for entry: atmospheric testing and continuous monitoring, ventilation, a permit, an attendant, retrieval systems, and a rescue plan, with supplied air where the atmosphere cannot be made safe. During construction the wet well is an entry hazard, and once operational it is among the most hazardous sewer confined spaces. (These follow the confined-space and sewer-manhole fundamentals.)

Electrical work in the wet environment

Lift stations have significant electrical and control systems operating in a wet, below-grade environment, creating shock and electrocution hazards amplified by the moisture. The controls are GFCI protection, proper grounding, qualified electrical work, lockout/tagout for installation and connections, equipment rated for the wet/hazardous location (lift stations can be classified hazardous locations due to the flammable sewer gases), and arc-flash precautions. (These follow the electrical-work fundamentals.)

Pumps, piping, and commissioning

Installing and commissioning the heavy pumps, piping, and controls involves rigging, the pump and pipe hazards, and the commissioning hazards. The controls are the relevant rigging, pipe, and commissioning controls, including the stored-energy and startup controls when the pumps are energized.

A simple Lift Station Construction JHA structure

Deep excavation, the wet well, and wet electrical work

A Lift Station Construction JHA is defined by three serious hazards: the deep excavation, the confined-space wet well, and the electrical work in the wet environment. The deep excavation is the cave-in hazard — the wet well is often very deep, requiring engineered protective systems and dewatering. The wet well is the confined-space hazard — a deep, permit-required confined space that holds the deadly sewer atmosphere once operational, requiring the full entry program. The electrical work is the shock hazard — significant electrical systems in a wet, below-grade, potentially hazardous-classified environment. A JHA that addresses the deep excavation with engineered protection, the wet well as the confined space it is, and the electrical work with the controls for the wet hazardous environment is the one that protects the lift station crew, because the operation combines three high-consequence hazards.

From the field: what actually goes wrong

In fourteen years across federal, heavy civil, and industrial projects, lift station construction combines three of the most serious hazards in utility work — deep excavation, confined-space wet well, and wet electrical — and the depth makes each more dangerous. The excavation is often very deep, and a deep excavation cave-in is almost always fatal, so the protective systems are engineered (deep excavations typically require engineered shoring or shielding designed by a professional engineer, beyond the standard tabulated data), dewatering controls the groundwater, and a competent person oversees it. This is not a routine trench; it is a deep, high-consequence excavation.

The wet well is the confined-space hazard, and once the lift station handles sewage it holds the same deadly sewer atmosphere as a sewer manhole — H2S, methane, oxygen deficiency — making it among the most hazardous confined spaces. During construction and especially after, entry follows the full confined-space program. The electrical work is the third hazard: lift stations have significant electrical and control systems in a wet, below-grade environment that can be a classified hazardous location due to the flammable sewer gases, so GFCI, proper grounding, qualified work, and hazardous-location-rated equipment matter. On the projects I have run, the lift station gets the engineered deep-excavation protection, the full confined-space program for the wet well, and the wet/hazardous-location electrical controls. The JHA that addresses all three is the one that protects the lift station crew.

The bottom line

A Lift Station Construction JHA names the deep-excavation, the confined-space, and the electrical hazards with specific controls — engineered protective systems and dewatering for the deep excavation, the full confined-space program for the wet well's sewer atmosphere, and GFCI, grounding, and hazardous-location-rated equipment for the wet electrical work. Three high-consequence hazards combine in the deep, wet, gassy environment. The JHA that addresses all three is the one that protects the crew.

Frequently asked questions

Why is the lift station excavation especially hazardous?

The wet well excavation is often very deep, and a deep excavation cave-in is almost always fatal. Deep excavations typically require engineered protective systems (shoring or shielding designed by a registered professional engineer, beyond the standard tabulated data), competent-person oversight, and dewatering to control the groundwater common at these depths.

Why is the wet well a confined-space hazard?

The wet well is a deep, permit-required confined space with limited access, and once the lift station handles sewage flow it holds the deadly sewer atmosphere — hydrogen sulfide, methane, and oxygen deficiency — making it among the most hazardous confined spaces. Entry follows the full confined-space program: testing, continuous monitoring, ventilation, a permit, an attendant, retrieval systems, and a rescue plan.

What electrical hazards does a lift station involve?

Lift stations have significant electrical and control systems operating in a wet, below-grade environment that can be a classified hazardous location due to the flammable sewer gases, creating shock and electrocution hazards amplified by the moisture. Controls are GFCI protection, proper grounding, qualified electrical work, lockout/tagout, hazardous-location-rated equipment, and arc-flash precautions.

Is dewatering needed for lift station construction?

Often yes — the deep wet well excavation typically encounters groundwater, requiring dewatering to control the water and keep the excavation safe and workable. The dewatering brings its own electrical and excavation-stability considerations.

Related JHAs

• Excavation and Trenching JHA — the deep wet well excavation
• Confined Space Entry JHA — entering the wet well
• Pump Station Construction JHA — related pumping infrastructure
• Dewatering Operations JHA — dewatering the deep excavation

Written by Mustafa Tok, CSP, ASP, CHST — OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.