Well and Cistern Safety

Wells and Cisterns Look Simple — but They Can Kill You

Wells and cisterns are essential water infrastructure on Texas ranches, but they also present serious confined space hazards that can be fatal. These underground or enclosed water storage systems may look straightforward, but they can harbor deadly atmospheric conditions, physical hazards, and structural dangers that demand respect and proper safety protocols.

Whether you're maintaining an active well, inspecting a cistern, or dealing with an abandoned water source, understanding the specific hazards and following appropriate safety measures is essential for protecting yourself and your workers.

---

Understanding the Hazards

Atmospheric Hazards

#### Oxygen Deficiency Wells and cisterns can become oxygen-deficient through several mechanisms:

• Biological activity: Bacteria and organic matter consume oxygen
• Chemical reactions: Rust, decomposition of materials
• Ground gases: Natural gases seeping into the space
• Stagnation: Lack of air circulation allows oxygen levels to drop

• Produced by sulfate-reducing bacteria
• Rotten egg smell at low concentrations; no odor at dangerous levels
• Can reach lethal concentrations in enclosed well spaces
• Produced by organic decomposition
• Can cause suffocation by displacing oxygen
• Can seep into wells from surrounding geology
• Explosive and asphyxiating
• Found in granite and certain rock formations
• Accumulates in enclosed underground spaces
• Long-term health hazard

Physical Hazards

#### Falls

• Vertical drops into wells can be fatal
• Wet, slippery surfaces around well openings
• Ladder failure during descent
• Unsecured covers giving way

• Water levels may be higher than expected
• Equipment can pin a person underwater
• Panic and disorientation in enclosed space
• Cold water shock

• Old well casings may be unstable
• Earthen walls can collapse
• Cistern structures may have deteriorated
• Debris accumulation above entry points

• Getting stuck in narrow well shafts
• Equipment tangling
• Debris blocking exit

Structural Hazards

#### Deteriorated Infrastructure

• Old brick or stone wells may have loose materials
• Concrete cisterns can crack and become unstable
• Metal casings may be corroded
• Covers and access points may be compromised

• Pump wiring near water
• Damaged insulation
• Improper grounding
• Equipment in wet conditions

Types of Water Storage Systems

Drilled Wells

Hand-Dug Wells

Cisterns

Spring Houses

---

When Entry May Be Required

Common Reasons for Well/Cistern Entry

• Pump repair or replacement
• Debris removal
• Inspection for damage or contamination
• Liner installation or repair
• Decommissioning abandoned wells
• Water quality investigation

Alternatives to Entry

• Remote camera inspection: Lower a camera to assess conditions
• Long-handled tools: Remove debris without entry
• Pumping and cleaning: Remove water and materials from outside
• Professional services: Hire well service companies with proper equipment
• Replacement: Sometimes safer and more economical than repair

Safe Entry Procedures

If entry into a well or cistern is absolutely necessary:

Pre-Entry Planning

• What is the water level?
• What is the structural condition?
• What atmospheric hazards might be present?
• What equipment is inside?
• Required equipment
• Personnel roles
• Emergency procedures

Equipment Requirements

• Calibrated and functioning
• Lowered into space before entry
• Retrieval line
• Tripod with winch for vertical entry
• Anchor point rated for rescue loads
• Flexible ducting to reach bottom of space
• Continuous operation during entry
• Eye protection
• Waterproof clothing as needed
• Appropriate footwear (non-slip, won't come off)
• Gloves
• Signal system if voice communication is difficult
• Hands-free lighting (headlamp)

Entry Procedure

• Prevent accidental pump activation
• Barricade area to prevent unauthorized access
• Test at multiple depths
• Wait for readings to stabilize
• Record results
• Hydrogen sulfide: Below 10 ppm
• Carbon monoxide: Below 25 ppm
• Combustible gases: Below 10% LEL
• Direct fresh air to bottom of space
• Allow adequate time (typically 15-30 minutes minimum)
• Re-test atmosphere
• Retrieval system ready for immediate use
• Communication confirmed
• Emergency contacts on hand
• Retrieval line secured
• Continuous atmospheric monitoring
• Communication verified
• Keep communication with attendant
• Monitor for atmospheric changes
• Complete work efficiently
• Report any unusual conditions
• Account for all personnel and equipment

Abandoned Wells and Cisterns

Hazards of Abandoned Water Sources

Abandoned wells and cisterns present unique dangers:

• Unknown conditions: No recent information about depth, water level, structure
• Deterioration: Years of neglect may have compromised integrity
• Unmarked locations: May be covered or hidden
• Accumulated hazards: Debris, dead animals, contamination
• Atmospheric unknowns: Gas accumulation over time

Legal Requirements in Texas

Texas requires proper plugging and abandonment of unused wells to:

• Protect groundwater from contamination
• Prevent physical hazards
• Maintain accurate water resource records

Securing Abandoned Wells

If you discover or have abandoned wells on your property:

• Mark the location clearly
• Secure the opening with a locking cover rated for anticipated loads
• Post warning signs
• Plan for proper plugging by a licensed well driller
• Document location in property records

Never Enter an Abandoned Well

Abandoned wells should never be entered without:

• Full confined space entry procedures
• Structural assessment by qualified person
• Complete atmospheric testing
• Professional rescue capability on standby

---

Children and Well Safety

Physical Hazards to Children

• Attempt to look down into wells
• Climb on well covers
• Play near cisterns
• Fall through deteriorated covers

Protection Measures

• Secure all openings: Locking covers rated for the weight of an adult
• Fencing: Enclose well heads and cistern access points
• Education: Teach children that wells and cisterns are dangerous, off-limits areas
• Inspection: Regularly check covers and barriers
• Visibility: Mark well locations clearly so they're not forgotten

Emergency Response

If Someone Falls Into a Well or Cistern

• Call 911 immediately
• Describe it as a confined space rescue
• Provide exact location
• Describe the type and depth of the well/cistern
• Report water level if known
• Do NOT enter to attempt rescue
• You'll likely become a second victim
• Atmospheric hazards may be present
• Communicate with victim
• If conscious, keep them calm
• Tell them help is coming
• Gather information about their condition
• Prepare for responders
• Direct them to exact location
• Provide any information about the structure
• Identify electrical shutoffs
• Attempt surface rescue only if safe
• Lowering a rope if victim can self-rescue
• Only if you can do so without entering the space

Technical Rescue Requirements

• Technical rope rescue training
• Confined space rescue equipment
• Atmospheric monitoring
• Often specialized equipment for narrow spaces

---

Maintenance and Inspection

Regular Well Inspection (From Surface)

• Check covers for security and condition
• Inspect wellhead for damage or contamination entry points
• Monitor pump house for atmospheric hazards
• Test water quality annually

Cistern Inspection

• Check structural integrity from outside
• Monitor water level and quality
• Inspect covers, hatches, and vents
• Note any signs of contamination or animal entry

When Professional Entry Is Needed

• Major repairs or modifications
• Post-contamination cleaning
• Equipment replacement
• Required inspections

---

Bottom Line

• Wells and cisterns are confined spaces with deadly atmospheric hazards.
• Oxygen deficiency can develop without warning in any enclosed underground space.
• Never enter without proper procedures: Test atmosphere, ventilate, have rescue capability.
• Alternatives exist: Cameras, long tools, pumping, and professional services can often eliminate the need for entry.
• Abandoned wells are especially dangerous and should never be entered without full assessment.
• Secure all openings to protect children and prevent accidents.
• Failed rescues are common: Don't enter to help someone without proper equipment.

Resources

• Texas Commission on Environmental Quality (TCEQ): tceq.texas.gov - Well regulations and plugging requirements
• Texas Water Well Drillers Association: twwda.com
• OSHA Confined Spaces: osha.gov/confinedspaces
• Texas AgriLife Extension: agrilifeextension.tamu.edu

• Atmospheric Testing
• Rescue Planning for Confined Spaces
• Tank Entry Procedures