Southern Water fined £2.4m for Kent sewage and diesel pollution

What Southern Water was fined for

Source: Environment Agency press release, 22 September 2026. Image: Environment Agency, Crown copyright, Open Government Licence v3.0.

Southern Water has been fined 2.4 million pounds after multiple sewage pollution incidents, in the Environment Agency's second successful prosecution of the company this year. The penalty was imposed at Bromley magistrates' court by district judge Stephen Leake. The fine itself was 2,416,666.67 pounds, with 69,894.04 pounds in costs and a 190 pound victim surcharge. The company pleaded guilty at Medway magistrates' court on 7 April to all five charges under regulations 12(1)(b) and 38(1)(a) of the Environmental Permitting (England and Wales) Regulations 2016. A further incident at Faversham in December 2019 was taken into account. The charges covered releases of untreated sewage, sewage debris, diesel and waste matter into the sea and a brook around Faversham and Whitstable between 2019 and 2021. Two of the incidents happened at the same time in different locations. The Environment Agency said other cases against the company are still going through court, so the total penalties may rise further.

For customers, the immediate question is whether the cost lands on bills. The Environment Agency states that water companies cannot raise prices to offset fines. Fines should reduce profits, dividends and executive bonuses instead. That principle matters because the penalty is paid by the company, not by households in the region. The Environment Agency has concluded more than 70 prosecutions against water and sewerage companies since 2015, securing fines of more than 150 million pounds. The regulator has also carried out 700 inspections of Southern Water sites in the past year, detailing 400 improvements needed. Lindsay Faulkner, Environment Agency environment manager for Kent, said the agency would not hesitate to prosecute. The fine follows a 7.1 million pound penalty weeks earlier for pollution that closed several beaches in Thanet for days, and a record 90 million pound fine in 2021 for thousands of illegal discharges off the south coast.

The incidents

The offences span three years and several locations. In July 2019, diesel from a leaking generator at the local wastewater treatment plant entered Swalecliffe Brook in Whitstable and then the sea during the summer holiday season. The public were warned to keep themselves and pets out of the water. In March 2020, over three days, Southern Water released untreated sewage into Faversham Creek after pumps stopped working. The company failed to report the initial circumstances to the Environment Agency. On the same day, sewage entered Swalecliffe Brook again. An almost identical incident followed in October 2020. In August 2021 there were further incidents in Whitstable. Investigators found around 70 dead fish including eels. Canterbury City Council put up warning signs at Tankerton and Herne Bay beaches against swimming for nearly a week. Coastal waters near Whitstable Harbour, a designated shellfishery, were affected.

The pattern described in court is one of repeated failures at the same sites, with two incidents occurring at the same time in different locations. The diesel release in 2019 came at the start of the summer holidays, when the brook and nearby sea are used by residents and visitors. The 2020 sewage releases into Faversham Creek lasted three days, and the company did not report the initial circumstances to the regulator. The October 2020 incident was almost identical to the March event. By August 2021, the impact was visible in the water: around 70 dead fish including eels were found, and warning signs stayed up at Tankerton and Herne Bay for nearly a week. The shellfishery near Whitstable Harbour, a designated area for shellfish, was also affected. These details formed the basis of the five charges to which the company pleaded guilty on 7 April.

Second prosecution this year and more to come

This is the Environment Agency's second successful prosecution of Southern Water this year. Weeks earlier, the company received a 7.1 million pound penalty for pollution that closed several beaches in Thanet for days. In 2021 it was fined a record 90 million pounds for thousands of illegal discharges off the south coast. The latest fine therefore sits alongside a series of earlier penalties. In July the Environment Agency announced legal proceedings against Southern Water and seven ex-staff over alleged permit breaches and conspiracy to defraud. The company appears in court in December over unrelated incidents at Herne Bay, where 49 homes and businesses were flooded with sewage, near Canterbury, and near Andover in Hampshire. Those proceedings are separate from the offences sentenced at Bromley magistrates' court.

The Environment Agency has also increased its inspection activity. Lindsay Faulkner, environment agency manager for Kent, said the agency carried out 700 inspections of Southern Water sites in the past year, detailing 400 improvements needed, and would not hesitate to prosecute. That inspection programme sits alongside the prosecutions. Since 2015, the Environment Agency has concluded more than 70 prosecutions against water and sewerage companies, securing fines of more than 150 million pounds. For customers in Kent, the December court dates are the next point at which further penalties could be imposed. The cases cover Herne Bay, where 49 homes and businesses were flooded with sewage, plus incidents near Canterbury and near Andover in Hampshire. The company and seven ex-staff face allegations of permit breaches and conspiracy to defraud in the July proceedings.

What it means for water bills

The Environment Agency states that water companies cannot raise prices to offset fines. Fines should reduce profits, dividends and executive bonuses. That position is central to how the penalty affects customers. The 2.4 million pound fine, the 69,894.04 pounds in costs and the 190 pound victim surcharge are borne by the company. The regulator's stated expectation is that the cost falls on shareholders and bonuses rather than on household bills. The same principle applied to the earlier 7.1 million pound penalty and the record 90 million pound fine in 2021. The Environment Agency has concluded more than 70 prosecutions against water and sewerage companies since 2015, with fines over 150 million pounds. It has also carried out 700 inspections of Southern Water sites in the past year and detailed 400 improvements needed.

Customers who want to understand how bills are set, what they cover and how to challenge them can use the KT water bill guides. Those guides explain the regulatory framework and the routes available to households. The key point from the Environment Agency is that fines are not a permitted cost that can be recovered through prices. The agency's stated aim is that penalties reduce profits, dividends and executive bonuses. With further criminal proceedings due in December over Herne Bay, Canterbury and Andover incidents, and the July proceedings against the company and seven ex-staff, the total financial and legal position may develop further. The Environment Agency has said it will not hesitate to prosecute, and its inspection programme continues alongside the court cases.

Source: Environment Agency: Southern Water fined for Kent pollution.

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Frequently asked questions

How much was Southern Water fined?

Southern Water was fined 2,416,666.67 pounds, plus 69,894.04 pounds in costs and a 190 pound victim surcharge, imposed at Bromley magistrates' court by district judge Stephen Leake. The penalty is described as a 2.4 million pound fine.

What were the offences?

Five charges under regulations 12(1)(b) and 38(1)(a) of the Environmental Permitting (England and Wales) Regulations 2016, covering releases of untreated sewage, sewage debris, diesel and waste matter into the sea and a brook around Faversham and Whitstable between 2019 and 2021. A further incident at Faversham in December 2019 was taken into account.

When did Southern Water plead guilty?

The company pleaded guilty at Medway magistrates' court on 7 April to all five charges.

Can the fine be added to customer bills?

The Environment Agency states water companies cannot raise prices to offset fines. Fines should reduce profits, dividends and executive bonuses.

What other penalties has Southern Water received?

Weeks earlier the company received a 7.1 million pound penalty for pollution that closed several beaches in Thanet for days. In 2021 it was fined a record 90 million pounds for thousands of illegal discharges off the south coast.