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West Sussex

We're investing £276.3 million in West Sussex to strengthen water supplies, protect the coast, and support growing local communities now and in the future.

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Protecting the coast and supporting growth in West Sussex

We’re taking significant steps to enhance West Sussex’s coastline and drive sustainable local development.

Over the next five years, our plans will dramatically reduce the use of storm overflows and modernise wastewater treatment sites so they can process higher volumes and  filter out more nutrients - like phosphorus - before releasing treated wastewater back into rivers and seas.

We’re also investing millions to strengthen infrastructure and protect future water supplies, including a major upgrade of our Hardham Water Supply Works. We’re expanding our supply network to support a growing population, reduce the risk of outages, and help keep local rivers healthy.

Our West Sussex 2025-2030

investment plans

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£54m at Hardham

As part of a £100 million investment to improve our water supply works, we’re upgrading our Hardham site to make it more resilient and prevent future outages and supply interruptions.

£7.4m in nitrate removal

We’re protecting drinking water quality by removing nitrate from the water we take from the environment by investing in nitrate schemes at our Mossy Bottom, Patching, Madehurst and Stanhope Lodge water supply works.

£2.5k to improve resilience

To reduce the risk of outages, we’re improving the resilience of our Burpham Water Supply Works. We’re also installing additional treatment to remove harmful microorganisms and protect drinking water supplies.

15m extra litres of water a day

We’re developing a water recycling scheme and pipeline transfer near Littlehampton to supplement river flows and provide a sustainable source of up to 15 million litres of water a day.

£23.3m in Worthing and Shoreham

We’re making improvements to Broadwater Water Supply Works to manage the impact of climate change and increase the site’s resilience. We’re reducing spills in Shoreham and improving nutrient removal at our Clapham site as part of our commitment to improve the health of over 1000km of rivers. A £14.9m upgrade to East Worthing Wastewater Treatment Works will make the site more resilient.

£95.3m in Chichester

We’re improving the quality of water leaving Thornham Wastewater Treatment Works with better UV treatment and nutrient removal to protect local shellfish. Nearly £15m is being spent on reducing spills at our Thornham and Pagham Wastewater Treatment Works, enhancing local bathing waters. We’re also increasing treatment capacity at Thornham to protect local communities from flooding and reduce the use of storm overflow releases.

£67.1m in Mid Sussex

To keep up with population growth and protect the environment, we’re upgrading our wastewater treatment sites, including Goddards Green and Scaynes Hill, where we’re reducing spills and improving screening. We’re increasing the capacity of Goddards Green and improving sludge treatment to generate renewable energy and supply farmers with this valuable byproduct. At Slaugham, we’re improving outflow quality by removing more unwanted nutrients.

£84.5m in Bognor Regis and Littlehampton

To support new homes and protect the environment, we’re increasing the capacity, resilience and quality of wastewater treatment at our Ford site. £14.8m will improve sludge treatment, so we and local farmers can benefit from its biofuel. We’re improving flow monitoring at our sites in the area to improve their ability to handle emergencies and reduce spills.

£122.2m in Arundel and the South Downs

We’re investing millions in conservation projects in the Arun Valley and the River Western Rother area. Lidsey Wastewater Treatment Works will benefit from £49m worth of improvements to make the site more resilient and reduce spills. We’re also making improvements to remove more phosphorus from treated wastewater returning to rivers across the area, protecting the surrounding environment.

£28.4m in Horsham

We’re improving the resilience of Hampers Lane Water Supply Reservoir to keep our customer’s taps flowing. £26m will help our sites treat wastewater to a higher standard, benefitting the local environment and ecology. This will include the removal of phosphorus from treated wastewater returning to rivers and seas. We’re also increasing treatment capacity at Horsham Wastewater Treatment Works.

£45.7m in Crawley, East Grinstead and Uckfield

Our investment will improve resilience of our Turners Hill Water Supply Reservoir to prevent future water outages. We’re also reducing spills in Wivelsfield, Barcombe and Nutley to protect the environment. Further investment at our wastewater treatment sites will see enhanced treatment and nutrient removal, protecting the health of local rivers.

£54m at Hardham

As part of a £100 million investment to improve our supply works, we’re upgrading our Hardham site to make it more resilient and prevent future outages and supply interruptions.

£7.4m in nitrate removal

We’re protecting drinking water quality by removing nitrate from the water we take from the environment by investing in nitrate schemes at our Mossy Bottom, Patching, Madehurst and Stanhope Lodge water supply works.

£2.5k to improve resilience

To reduce the risk of outages, we’re improving the resilience of our Burpham Water Supply Works. We’re also installing additional treatment to remove harmful microorganisms and protect drinking water supplies.

15m extra litres of water a day

We’re developing a water recycling scheme and pipeline transfer near Littlehampton to supplement river flows and provide a sustainable source of up to 15 million litres of water a day.

£67.1m in Mid Sussex

To keep up with population growth and protect the environment, we’re upgrading our wastewater treatment sites, including Goddards Green and Scaynes Hill, where we’re reducing spills and improving screening. We’re increasing the capacity of Goddards Green and improving sludge treatment to generate renewable energy and supply farmers with this valuable byproduct. At Slaugham, we’re improving outflow quality by removing more unwanted nutrients.

£23.3m in Worthing and Shoreham

We’re making improvements to Broadwater Water Supply Works to manage the impact of climate change and increase the site’s resilience. We’re reducing spills in Shoreham and improving nutrient removal at our Clapham site as part of our commitment to improve the health of over 1000km of rivers. A £14.9m upgrade to East Worthing Wastewater Treatment Works will make the site more resilient.

£84.5m in Bognor Regis and Littlehampton

To support new homes and protect the environment, we’re increasing the capacity, resilience and quality of wastewater treatment at our Ford site. £14.8m will improve sludge treatment, so we and local farmers can benefit from its biofuel. We’re improving flow monitoring at our sites in the area to improve their ability to handle emergencies and reduce spills.

£122.2m in Arundel and the South Downs

We’re investing millions in conservation projects in the Arun Valley and the River Western Rother area. Lidsey Wastewater Treatment Works will benefit from £49m worth of improvements to make the site more resilient and reduce spills. We’re also making improvements to remove more phosphorus from treated wastewater returning to rivers across the area, protecting the surrounding environment.

£95.3m in Chichester

We’re improving the quality of water leaving Thornham Wastewater Treatment Works with better UV treatment and nutrient removal to protect local shellfish. Nearly £15m is being spent on reducing spills at our Thornham and Pagham Wastewater Treatment Works, enhancing local bathing waters. We’re also increasing treatment capacity at Thornham to protect local communities from flooding and reduce the use of storm overflow releases.

£28.4m in Horsham

We’re improving the resilience of Hampers Lane Water Supply Reservoir to keep our customer’s taps flowing. £26m will help our sites treat wastewater to a higher standard, benefitting the local environment and ecology. This will include the removal of phosphorus from treated wastewater returning to rivers and seas. We’re also increasing treatment capacity at Horsham Wastewater Treatment Works.

£45.7m in Crawley, East Grinstead and Uckfield

Our investment will improve resilience of our Turners Hill Water Supply Reservoir to prevent future water outages. We’re also reducing spills in Wivelsfield, Barcombe and Nutley to protect the environment. Further investment at our wastewater treatment sites will see enhanced treatment and nutrient removal, protecting the health of local rivers.

Area overview

In West Sussex we have...

  • 19 Water supply works
  • 37 Water service reservoirs
  • 99 Wastewater treatment works
  • 679 Wastewater pumping stations.
Area overview

In West Sussex we have...

19 Water Supply Works
37 Water Service Reservoirs
99 Wastewater Treatment Works
679 Wastewater Pumping Stations

Area overview

In West Sussex we have...

  • 19 Water Supply Works
  • 37 Water Service Reservoirs
  • 99 Wastewater Treatment Works
  • 679 Wastewater Pumping Stations