Dataset

Hogsmill Water Quality

Dataset summary

Observations

11 October 2025

Downstream Stepping Stones

20 parameters tested

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

11 October 2025

Green Lanes A (downstream of old green lanes stream)

20 parameters tested

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

10 October 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, pollution sources, secchi depth (clarity), water flow, water level, water temperature

10 October 2025

Ewell Storm Tank

15 parameters tested

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

10 October 2025

Bonesgate

18 parameters tested

air temperature, algae, alkalinity, ammonia, chlorine, clarity, conductivity, current weather, current weather description, hardness, nitrate, odour, oxygen, ph, phosphate, pollution sources, water level, water temperature

9 October 2025

Berrylands Bridge

13 parameters tested

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

8 October 2025

Bonegate Stream

25 parameters tested

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

6 October 2025

Saipem S2- Middle Mill

13 parameters tested

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

23 September 2025

Middle Mill

22 parameters tested

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

15 September 2025

Bonegate Stream

22 parameters tested

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

13 September 2025

Downstream Stepping Stones

21 parameters tested

air temperature, algae, 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

13 September 2025

Green Lanes A (downstream of old green lanes stream)

21 parameters tested

air temperature, algae, 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 September 2025

Ewell Storm Tank

13 parameters tested

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

12 September 2025

Bonesgate

17 parameters tested

air temperature, alkalinity, ammonia, chlorine, clarity, conductivity, current weather, current weather description, hardness, nitrate, oxygen, ph, phosphate, pollution sources, weather in the past 24hrs, water level, water temperature

11 September 2025

Berrylands Bridge

13 parameters tested

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

11 September 2025

Middle Mill

21 parameters tested

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

9 September 2025

Saipem S5 - Tolworth Brook

20 parameters tested

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

8 September 2025

Saipem S2- Middle Mill

15 parameters tested

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

28 August 2025

Middle Mill

21 parameters tested

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