Sussex Police, West Sussex Fire and Rescue Service and Southern Water were called to the scene.
Up to nine properties were flooded, according to reports.
A spokesperson for Southern Water said: “We experienced a technical failure at our Foreshore Water Pumping Station in the early hours of Thursday, February 19.
“The heavy rainfall combined with the technical fault have resulted in customers being impacted by internal flooding at St Catherine’s Road and South Terrace, Littlehampton.
“We have worked with the emergency services to help manage the flooding throughout the night. Our customer team have also been on hand to help those residents affected.
“Our engineering teams have managed to get the site operational. We apologise to those customers who have been affected.”
A spokesperson for West Sussex Fire and Rescue Service said: “We were called at 7.20pm on February 18 to reports of flooding in South Terrace, Littlehampton.
“Joint Fire Control mobilised three fire engines to the scene.
“Upon arrival crews were met with rising water levels in the surrounding area and quickly identified that several basement properties were under threat of flooding. Firefighters pumped floodwater from the affected properties.
“Sussex Police and officers from Southern Water and Arun District Council were also in attendance.
“The last crew left the scene at 12.45am on Thursday morning (February 19).”
A Sussex Police spokesperson said: “Police were called at 8.15pm on Wednesday, February 18 following a report of flooding in South Terrace, Littlehampton.
“We supported partners including the fire service and the local council to make the area safe for the public.”

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A number of properties in Littlehampton were flooded on February 18. Emergency services attended the scene. Picture: Eddie Mitchell Photo: EDDIE MITCHELL

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A number of properties in Littlehampton were flooded on February 18. Emergency services attended the scene. Picture: Eddie Mitchell Photo: EDDIE MITCHELL

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A number of properties in Littlehampton were flooded on February 18. Emergency services attended the scene. Picture: Eddie Mitchell Photo: EDDIE MITCHELL

