Dataset

Hogsmill Water Quality

Dataset summary

Observations

25 August 2025

Bonegate Stream

18 parameters tested

air temperature, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, oxygen, ph, weather in the past 24hrs, water depth, water flow, water level, water temperature

14 August 2025

Downstream Stepping Stones

20 parameters tested

air temperature, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, oxygen, ph, phosphate, weather in the past 24hrs, water depth, water flow, water level, water temperature

14 August 2025

Green Lanes A (downstream of old green lanes stream)

20 parameters tested

air temperature, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, oxygen, ph, phosphate, weather in the past 24hrs, water depth, water flow, water level, water temperature

8 August 2025

Ewell Storm Tank

21 parameters tested

air temperature, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, oxygen, ph, phosphate, pollution sources, weather in the past 24hrs, water depth, water flow, water level, water temperature

8 August 2025

Bonesgate

23 parameters tested

air temperature, algae, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, current weather description, hardness, nitrate-nitrogen, odour, water surface, oxygen, ph, pollution sources, weather in the past 24hrs, weather in the past 24hrs description, water depth, water flow, water level, water temperature

7 August 2025

Berrylands Bridge

14 parameters tested

air temperature, alkalinity, ammonia, chlorine, conductivity, current weather, current weather description, hardness, nitrate-nitrogen, oxygen, ph, phosphate, water depth, water temperature

29 July 2025

Saipem S3 - Chapel Mill Road

15 parameters tested

air temperature, alkalinity, ammonia, chlorine, conductivity, current weather, current weather description, hardness, nitrate-nitrogen, ph, phosphate, weather in the past 24hrs, weather in the past 24hrs description, water depth, water temperature

17 July 2025

Saipem S4 - Berrylands playground

16 parameters tested

air temperature, alkalinity, ammonia, chlorine, conductivity, current weather, current weather description, hardness, nitrate-nitrogen, ph, phosphate, weather in the past 24hrs, weather in the past 24hrs description, secchi depth (clarity), water depth, water temperature

16 July 2025

Saipem S5 - Tolworth Brook

23 parameters tested

air temperature, algae, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, current weather description, hardness, nitrate-nitrogen, nitrites, odour, water surface, ph, weather in the past 24hrs, weather in the past 24hrs description, secchi depth (clarity), water depth, water flow, water level, water temperature

15 July 2025

Bonegate Stream

19 parameters tested

air temperature, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, oxygen, ph, weather in the past 24hrs, water depth, water flow, water level, water temperature

15 July 2025

Middle Mill

18 parameters tested

algae, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, ph, weather in the past 24hrs, water depth, water flow, water level, water temperature

14 July 2025

Saipem S3 - Chapel Mill Road

13 parameters tested

air temperature, alkalinity, ammonia, chlorine, conductivity, current weather, hardness, nitrate-nitrogen, ph, phosphate, weather in the past 24hrs, water depth, water temperature

12 July 2025

Downstream Stepping Stones

20 parameters tested

air temperature, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, oxygen, ph, phosphate, weather in the past 24hrs, water depth, water flow, water level, water temperature

12 July 2025

Green Lanes A (downstream of old green lanes stream)

20 parameters tested

air temperature, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, oxygen, ph, phosphate, weather in the past 24hrs, water depth, water flow, water level, water temperature

11 July 2025

Bonesgate

20 parameters tested

air temperature, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, oxygen, ph, phosphate, weather in the past 24hrs, water depth, water flow, water level, water temperature

10 July 2025

Berrylands Bridge

14 parameters tested

air temperature, alkalinity, ammonia, chlorine, conductivity, current weather, current weather description, hardness, nitrate-nitrogen, oxygen, ph, phosphate, water depth, water temperature

10 July 2025

Ewell Storm Tank

19 parameters tested

air temperature, alkalinity, ammonia, chlorine, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, oxygen, ph, phosphate, weather in the past 24hrs, water depth, water flow, water level, water temperature

8 July 2025

Saipem S2- Middle Mill

15 parameters tested

air temperature, alkalinity, ammonia, chlorine, conductivity, current weather, current weather description, hardness, nitrate-nitrogen, ph, phosphate, weather in the past 24hrs, weather in the past 24hrs description, water depth, water temperature

24 June 2025

Middle Mill

19 parameters tested

air temperature, algae, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, ph, weather in the past 24hrs, water depth, water flow, water level, water temperature

14 June 2025

Bonegate Stream

19 parameters tested

air temperature, alkalinity, ammonia, chlorine, clarity, colour, conductivity, current weather, hardness, nitrate-nitrogen, odour, water surface, oxygen, ph, weather in the past 24hrs, water depth, water flow, water level, water temperature