PumpProfessionals.wikiAn independent record of Pump Professionals, an online pump and septic supplier, and the equipment it sells

Alarms and controls

From PumpProfessionals.wiki, an independent record of Pump Professionals and the pumps, valves and septic parts it lists

Researched and compiled by the Pump Professionals Wiki editorial team · First published · Revised

The short version: A high-water alarm sounds when liquid in a sump, sewage or septic pump basin rises above the normal pump-on level; the first steps are to cut water use, silence the horn and check the pump.[3][1]

A note on independence: PumpProfessionals.wiki is an independent record compiled from pumpprofessionals.com, manufacturer pages, EPA guidance, Indiana’s on-site sewage rule and general references. It is not operated by Pump Professionals and does not sell anything. Prices and stock change; confirm with the supplier at (317) 674-3819. Sourcing rules: editorial policy.

What an alarm does

A high-water alarm warns when the liquid in a sump, sewage basin, grinder tank or septic pump chamber rises above the normal “pump on” level. A grinder pump station’s alarm panel, for example, should have both a buzzer and an indicator light.[3] The alarm float is set above the pump’s own float, so it only trips if the pump has failed, cannot keep up, or has lost power.[3][2]

When the alarm goes off

The supplier’s two alarm guides give similar first steps.[1][4]

  1. Reduce water use at once: no laundry, dishwasher, showers or flushing more than necessary.[1]
  2. Silence the horn with the silence button; the light should stay on.[1][2]
  3. Check whether the pump’s breaker or GFCI has tripped and whether the pump is running.
  4. Wait: if the level drops and the alarm clears, the pump was temporarily overwhelmed.[1]
  5. If it does not clear, call a qualified pump or septic technician; do not open a sewage basin yourself.

The supplier’s guide also attributes a percentage of alarm causes to a trade association without linking a source; it is not repeated here.[1]

Floats, panels and alarms

Most residential and small commercial pump systems use float switches: a pump float that starts and stops the pump, and a separate alarm float.[3] Larger systems use a control panel that alternates pumps and adds pumps as levels rise, such as the Liberty QE quadplex panels the supplier lists with six floats.[5] Smaller installations use a stand-alone alarm, such as SPI’s Observer series, or a plug-in junction box with built-in alarm, such as SPI’s Caddy Box.[2]

A pump that runs continuously

The opposite fault is a pump that never stops. The supplier’s guide on wastewater pumps running continuously lists five fixes.[6] Common causes are a stuck float, a failed check valve letting discharge water back into the basin, a high inflow such as groundwater or a leaking fixture, or a worn pump that can no longer reach the off level.[7][6] A sump pump that runs but moves no water is the subject of another supplier guide; air locks, blocked intakes, frozen discharge lines and worn impellers are the usual suspects.[8][9]

Choosing an alarm

  • Indoor or outdoor rating.
  • Separate circuit from the pump, so it sounds if the pump breaker trips.
  • Battery backup for power cuts.
  • Auxiliary contacts if it should report to a monitoring system.
  • Float type (mechanical or mercury) and cord length.[2]

See SPI controls and alarms for listed models and prices.

Inspection

The EPA says systems with electrical float switches, pumps or mechanical components should generally be inspected once a year, and that a service contract is important for such systems.[10] Testing the alarm by lifting its float is a simple part of that check.

Common questions

What should I do if my pump alarm goes off?

Cut water use, silence the horn, check the breaker and pump, and call a technician if the alarm does not clear.

Why is there a separate alarm float?

It sits above the pump float and only trips if the pump fails or cannot keep up.

How often should pump systems be inspected?

Generally once a year for septic systems with pumps or floats, according to the EPA.

Related entries

Endnotes

  1. ^ a b c d e f How to troubleshoot common wastewater pump alarms (2026). Pump Professionals (pumpprofessionals.com). Retrieved 9 November 2026.
  2. ^ a b c d SPI (brand listing). Pump Professionals (pumpprofessionals.com). Retrieved 9 November 2026.
  3. ^ a b c d Grinder pump. Wikipedia. Retrieved 9 November 2026.
  4. ^ What to do if your sump pump alarm goes off (2025). Pump Professionals (pumpprofessionals.com). Retrieved 9 November 2026.
  5. ^ Liberty Pumps (brand listing). Pump Professionals (pumpprofessionals.com). Retrieved 9 November 2026.
  6. ^ a b Why does my wastewater pump run continuously? (2026). Pump Professionals (pumpprofessionals.com). Retrieved 9 November 2026.
  7. ^ Check valve. Wikipedia. Retrieved 9 November 2026.
  8. ^ Why is your sump pump running but not pumping water? (2026). Pump Professionals (pumpprofessionals.com). Retrieved 9 November 2026.
  9. ^ How to keep a sump pump from freezing (2026). Pump Professionals (pumpprofessionals.com). Retrieved 9 November 2026.
  10. ^ How to care for your septic system. U.S. EPA. Retrieved 9 November 2026.