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Our water is some of the highest quality in the world, and we want to keep it that way.

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Catchment Advisor Anne Blokhus, working with a farm in the Eastern Rother river catchment.

To keep our rivers and groundwater sources healthy, our expert team manages distinct areas around our water sources, known as catchments.

More details about each catchment can be found below, with details of your local Catchment Advisor.

If you need any more information, please get in touch with your local advisor below or email catchment@southeastwater.co.uk.

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Did you know...

As part of our catchment management programme, we offer grants of up to £10,000 for on-farm improvements and other initiatives to improve river and groundwater quality?

Eastbourne

The Eastbourne groundwater catchment is located in the South Downs National park and extends from the town of Eastbourne to the River Cuckmere. We abstract groundwater from Eastbourne Aquifer before turning it into top-quality drinking water.

The issues within this catchment include high concentrations of nitrate in the groundwater.

To find out more about this catchment, please contact Steve Howe.

Email: Steve.Howe@southeastwater.co.uk Call: 07812671390

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Views of Cornish farm, with the Belle Tout Lighthouse on Beachy Head showing in the background.

Eastern Rother

The Eastern Rother catchment lies within the High Weald Area of Outstanding Natural Beauty (AONB) and surrounds the town of Mayfield, beginning below Wadhurst and Ticehurst in the north-east and ending north of Heathfield in the south.

Our main concern in this catchment is metaldeyhyde, a pesticide found in some slug pellets.

To find out more about this catchment, please contact Anne Blokhus or download the documents below.

Email: anne.blokhus@southeastwater.co.uk Call: 07813405900

Supporting documents

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Views of the Eastern Rother landscape

East Meon

East Meon is a small groundwater catchment located to the south of the village of East Meon in Hampshire.

The catchment includes a section of the River Meon and is predominately made up of agricultural land, situated in the South Downs National Park.

Our main concern for the East Meon catchment is for nitrates.

To find out more about this catchment, please contact Mark Slater.

Email: Mark.Slater@southeastwater.co.uk Call: 07773 649560

Hartlake

Hartlake is a groundwater catchment consisting of an aquifer running along the course of the River Medway near Tonbridge.

This source is at risk from nitrates and the pesticide Metaldehyde, with pollutants potentially coming from the River Medway.

We're continuing to analyse the quality of this groundwater source and investigate if, and how, it could benefit from our catchment management programme.

Hartley

The Hartley groundwater catchment is located in south of Dartford, and similar to North Kent in relation to small villages, inter-crossed arable farming.

Water abstraction in the catchment is from chalk and greensand sources at Hartley and Ridley.

The area has a number of equestrian holdings, but arable farming is the main agricultural land use (61%).

For more information on this catchment, please contact Graham Earl.

Email: Graham.Earl@southeastwater.co.uk Call: 07966329085

Kemsing

The Kemsing groundwater catchment is located near Sevenoaks, Kent.

The catchment is quite built up and a comprises of large domestic holdings. As a result 52% of the catchment is pasture and 18% is commercial arable.

For more information on this catchment, please contact Graham Earl.

Email: Graham.Earl@southeastwater.co.uk Call: 07966329085

Lasham

Lasham is a chalk groundwater catchment, comprising of a series of boreholes, that extends north west of Alton, in Hampshire.

The catchment extends towards the villages of Medstead, Preston Candover and Southrope and includes predominately agricultural land, but also some small villages and individual residential properties. It is likely linked to the Candover tributary of the River Itchen and the North Wey at Alton tributary of the River Wey with the source protection zone extending into both surface water catchments.

Our main concern in the Lasham catchment is for nitrates, with water resources also being of concern for the linked surface water catchments.

To find out more about this catchment, please contact Mark Slater.

Email: Mark.Slater@southeastwater.co.uk Call: 07773 649560

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King's Pond, Lasham

Lower Thames

The Lower Thames catchment covers the main river and its tributaries between Cookham and Teddington.

It’s a well populated area with lots of settlements, transport links and historic parkland, golf courses and polo grounds interspersed with agricultural land.

The main water quality concerns are pesticides such as metaldehyde used to kill slugs and carbetamide and propyzamide used on oilseed rape

For more information about this catchment, please contact Charlotte Elliot.

Email: Charlotte.Elliot@southeastwater.co.uk Call: 07779 779817

Maidenhead

For more information about this catchment, please contact Charlotte Elliot.

Email: Charlotte.Elliot@southeastwater.co.uk Call: 07779 779817

North Kent

The North Kent is groundwater catchment is located between the River Medway and the River Stour, directly opposite the Swale estuary.

The catchment includes numerous small villages where around 60% of the land is used for agriculture. There is also a vast amount of hop gardens, protected soft fruit and top fruit.

For more information on this catchment, please contact Michaela James.

Email: Michaela.James@southeastwater.co.uk Call: 07970 270138

Pembury

To find out more about this catchment, please contact Al Stewart or download the document below.

Email: Al.Stewart@southeastwater.co.uk Call: 07812497249

Supporting documents

River Cuckmere

The River Cuckmere catchment covers almost 90 square miles, from Heathfield in the north to beyond Polegate in the south.

When flows in the Cuckmere are high, we pump water into our Arlington Reservoir before treating it and distributing it to homes and businesses.

Our main concern in this catchment is metaldehyde, a pesticide found in some slug pellets.

To find out more about this catchment, please contact Anne Blokhus or download the documents below.

Email: anne.blokhus@southeastwater.co.uk Call: 07813405900

Supporting documents

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Arlington Reservoir, part of the River Cuckmere catchment

River Ouse

The River Ouse is the second largest river in Sussex and is more than 38 miles long.

The catchment includes the towns of Haywards Heath, East Grinstead, Balcome, Maresfield and Uckfield.

Our main concern in this catchment is metaldeyhyde, a pesticide found in some slug pellets.

To find out more about this catchment, please contact Anne Blokhus or download the documents below.

Email: anne.blokhus@southeastwater.co.uk Call: 07813405900

Supporting documents

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Ardingly reservoir is part of the River Ouse catchment

River Teise

The River Teise catchment covers areas including Paddock Wood, Marden, Horsmonden, Goudhurst, Royal Tunbridge Wells and Wadhurst.

A tributary of the River Medway, the catchment covers more than 146 square miles.

This catchment includes Bewl Water, although the reservoir is owned and managed by Southern Water.

As well as metaldehyde, a substance found in slug pellets, other concerns include the herbicides carbetamide and propyzamide.

To find out more about this catchment, please contact Al Stewart or download the document below.

Email: Call: 07812497249

Supporting documents

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Seaford

The Seaford groundwater catchment is located in the South Downs National Park and lies between the Rivers Cuckmere and Ouse.

The issues within this catchment include high concentrations of nitrate and chloride in the groundwater.

To find out more about this catchment, please contact Steve Howe.

Email: Steve.Howe@southeastwater.co.uk Call: 07812671390

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Stockbury

The Stockbury groundwater catchment is located near to North Kent catchment, and has similar attributes. This is a smaller catchment in comparison and provides water for the surrounding area.

This catchment is very rural with 92% in agricultural use. The main land use in the area is arable systems, that accounts for about 65% of the agricultural land use. This particular area is unique compared to others as there is a strong equestrian influence, so on the steeper slopes there is permanent pastures that account for 27% of the catchment.

For more information on this catchment, please contact Michaela James.

Email: Michaela.James@southeastwater.co.uk Call: 07970 270138

Wallers Haven

The Upper Wallers Haven has a catchment area of 34 square miles and flows into the Pevensey Levels, which is a Site of Special Scientific Interest (SSSI).

The catchment begins south of Burwash and stretches from Herstmonceux in the west to Ninfield in the south-east.

As well as the chemical metaldehyde, found in slug pellets, other concerns include the herbicides carbetamide and propyzamide.

To find out more about this catchment, please contact Anne Blokhus or download the documents below.

Email: anne.blokhus@southeastwater.co.uk Call: 07813405900

Supporting documents

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Our abstraction point on the Wallers Haven river at Hazards Green Water Treatment Works, near Battle.

West Ham

West Ham is a chalk groundwater catchment located directly to the west of Basingstoke.

It includes a mixture of urban, sub-urban and agricultural land as well as a section of the Basingstoke to River Lyde confluence of the River Loddon.

Our main concern in the West Ham catchment is for nitrates, which will also link to the Woodgarston catchment work.

To find out more about this catchment, please contact Mark Slater.

Email: Mark.Slater@southeastwater.co.uk Call: 07773 649560

Windmill Hill

Windmill Hill is a groundwater abstraction within the south of Alton in Hampshire, where it extends north and links with the Lasham catchment.

Much of the catchment is overlain by the town with the catchment also including a section of the tributaries of the North Wey.

Our main concern for the catchment is for nitrates, with nitrites also being of some concern.

To find out more about this catchment, please contact Mark Slater.

Email: Mark.Slater@southeastwater.co.uk Call: 07773 649560

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Caker Stream, Windmill Hill

Woodgarston

Woodgarston is a chalk groundwater catchment located to the north west of Basingstoke, extending west from the village of Wootton Saint Lawrence to Hannington.

The catchment sits within the surface water catchments of the Rivers Test, Loddon and Kennet and is also part of the North Wessex Downs Area of Outstanding Natural Beauty (AONB).

We are particularly concerned with nitrates within the Woodgarston catchment and have begun working with land managers to improve nitrate use efficacy.

To find out more about this catchment, please contact Mark Slater or download the document below.

Email: Mark.Slater@southeastwater.co.uk Call: 07773 649560

Supporting documents

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Clover is used as a cover crop in Ley, near Hannington.