Water Quality Monitoring at Tai Shui Hang

Environmental Protection Department (EPD) has set up four water quality monitoring points from the upstream to downstream along Tai Shui Hang (namely TSH1, TSH2, TSH3 and TSH4). Their locations are shown in the map below. EPD collects water samples twice a month during the wet season (i.e. March to October) and once a month during the dry season (i.e. November to February of the next year).
 
Locations of Water Quality Monitoring Points at Tai Shui Hang

Location of Water Quality Monitoring Point at Tai Shui Hang

 

Please click here for monitoring results of year 2018 to 2021 

 

Water Quality Monitoring Point (1) Weather Condition

Chemical Oxygen
Demand (mg/L)

 5-day Biochemical Oxygen Demand (mg/L) Total Suspended Solids (mg/L) Ammonia-
Nitrogen (mg/L)
Date of sample taken : 10/1/2022
TSH1 Sunny N/A (3) <2 15 0.018
TSH2 Sunny N/A (3) 2.9 49 (4) 0.29
TSH3 Sunny <5 <2 <3 0.017
TSH4 Sunny <5 <2 <3 <0.01
Date of sample taken : 15/2/2022
TSH1 Sunny N/A (3) <2 10 0.036
TSH2 Sunny N/A (3) <2 9.5 0.16
TSH3 Sunny 10 <2 <3 <0.01
TSH4 Sunny <5 <2 <3 <0.01
Date of sample taken : 11/3/2022
TSH1 Sunny N/A (3) <2 6.7 0.082
TSH2 Sunny N/A (3) <2 9.7 0.11
TSH3 Sunny 5 <2 <3 <0.01
TSH4 Sunny <5 <2 <3 <0.01
Date of sample taken : 22/3/2022
TSH1 Sunny N/A (3) <2 26 0.25
TSH2 Sunny N/A (3) <2 24 0.35
TSH3 Sunny 19 <2 7 0.02
TSH4 Sunny <5 <2 8.6 0.017
Date of sample taken : 7/4/2022
TSH1 Sunny N/A (3) <2 8.2 0.16
TSH2 Sunny N/A (3) <2 11 0.16
TSH3 Sunny 14 <2 <3 <0.01
TSH4 Sunny 12 <2 26 0.014
Date of sample taken : 21/4/2022
TSH1 Sunny N/A (3) <2 17 0.13
TSH2 Sunny N/A (3) <2 18 0.17
TSH3 Sunny <5 <2 <3 0.01
TSH4 Sunny <5 <2 3.3 0.017
Date of sample taken : 5/5/2022
TSH1 Sunny N/A (3) <2 5 0.092
TSH2 Sunny N/A (3) <2 8.3 0.1
TSH3 Sunny 6 <2 <3 <0.01
TSH4 Sunny <5 <2 <3 <0.01
Date of sample taken : 24/5/2022
TSH1 Cloudy N/A (3) <2 <3 0.046
TSH2 Cloudy N/A (3) <2 15 0.061
TSH3 Cloudy <5 <2 <3 3.4
TSH4 Cloudy <5 <2 <3 <0.01
Date of sample taken : 13/6/2022
TSH1 Cloudy N/A (3) N/A (4) N/A (4) <0.01
TSH2 Cloudy N/A (3) N/A (4) N/A (4) <0.01
TSH3 Cloudy 6 <2 8.2 <0.01
TSH4 Cloudy <5 <2 15 <0.01
Date of sample taken : 23/6/2022
TSH1 Sunny N/A (3) <2 18 0.081
TSH2 Sunny N/A (3) <2 17 0.076
TSH3 Sunny <5 <2 <3 0.03
TSH4 Sunny <5 <2 3.5 0.014
Date of sample taken : 15/7/2022
TSH1 Sunny N/A (3) <2 9.3 0.15
TSH2 Sunny N/A (3) <2 9.7 <0.01
TSH3 Sunny <5 <2 <3 <0.01
TSH4 Sunny <5 <2 <3 <0.01
Date of sample taken : 21/7/2022
TSH1 Sunny N/A (3) <2 20 <0.01
TSH2 Sunny N/A (3) <2 17 <0.01
TSH3 Sunny <5 <2 <3 <0.01
TSH4 Sunny <5 <2 <3 <0.01
Date of sample taken : 2/8/2022
TSH1 Sunny N/A (3) <2 21 0.034
TSH2 Sunny N/A (3) <2 13 0.15
TSH3 Sunny <5 <2 <3 0.026
TSH4 Sunny 9 <2 <3 0.024
Date of sample taken : 16/8/2022
TSH1 Sunny N/A (3) <2 15 0.11
TSH2 Sunny N/A (3) <2 17 0.27
TSH3 Sunny <5 2.6 <3 0.46
TSH4 Sunny 8 2.5 4.3 0.44
Date of sample taken : 5/9/2022
TSH1 Sunny N/A (3) <2 7.5 0.093
TSH2 Sunny N/A (3) <2 14 0.052
TSH3 Sunny <5 <2 <3 0.04
TSH4 Sunny <5 <2 <3 0.11
Date of sample taken : 22/9/2022
TSH1 Sunny N/A (3) <2 4.4 0.081
TSH2 Sunny N/A (3) <2 5.3 0.61
TSH3 Sunny <5 <2 <3 0.4
TSH4 Sunny <5 <2 <3 0.049
Date of sample taken : 10/10/2022
TSH1 Sunny N/A (3) <2 22 0.097
TSH2 Sunny N/A (3) <2 19 0.17
TSH3 Sunny <5 <2 <3 <0.01
TSH4 Sunny <5 <2 3.6 <0.01
Date of sample taken : 21/10/2022
TSH1 Sunny N/A (3) <2 22 0.039
TSH2 Sunny N/A (3) <2 7.3 0.06
TSH3 Sunny <5 <2 <3 <0.01
TSH4 Sunny <5 <2 <3 <0.01
Date of sample taken : 14/11/2022
TSH1 Cloudy N/A (3) <2 17 0.23
TSH2 Cloudy N/A (3) <2 25 0.69
TSH3 Cloudy 14 <2 <3 0.015
TSH4 Cloudy <5 <2 <3 0.011
Date of sample taken : 8/12/2022
TSH1 Sunny N/A (3) <2 14 0.15
TSH2 Sunny N/A (3) <2 16 0.22
TSH3 Sunny <5 <2 <3 0.027
TSH4 Sunny <5 <2 <3 0.037
Date of sample taken : 19/1/2023
TSH1 Sunny N/A (3) <2 26 0.2
TSH2 Sunny N/A (3) <2 14 0.77
TSH3 Sunny <5 <2 <3 <0.01
TSH4 Sunny <5 <2 <3 <0.01
Date of sample taken : 8/2/2023
TSH1 Cloudy N/A (3) <2 18 0.13
TSH2 Cloudy N/A (3) <2 16 0.53
TSH3 Cloudy 5 <2 <3 0.029
TSH4 Cloudy 10 <2 <3 0.046
Date of sample taken : 2/3/2023
TSH1 Sunny N/A (3) <2 10 0.16
TSH2 Sunny N/A (3) <2 20 0.2
TSH3 Sunny <5 <2 <3 <0.01
TSH4 Sunny <5 <2 17 <0.01
Date of sample taken : 16/3/2023
TSH1 Sunny N/A (3) <2 9.9 0.24
TSH2 Sunny N/A (3) <2 14 0.35
TSH3 Sunny <5 <2 <3 0.047
TSH4 Sunny <5 <2 <3 0.019
Date of sample taken : 14/4/2023
TSH1 Cloudy N/A (3) <2 8.4 0.14
TSH2 Cloudy N/A (3) <2 8.5 0.49
TSH3 Cloudy <5 3.2 3.4 0.95
TSH4 Cloudy <5 2.2 <3 0.35
Date of sample taken : 24/4/2023
TSH1 Cloudy N/A (3) <2 6.5 0.09
TSH2 Cloudy N/A (3) <2 9 0.13
TSH3 Cloudy 7 3.5 3.3 0.39
TSH4 Cloudy 12 9.3 5 0.47
Date of sample taken : 4/5/2023
TSH1 Sunny N/A (3) <2 41 (4) 0.16
TSH2 Sunny N/A (3) <2 58 (4) 0.076
TSH3 Sunny 5.5 <2 3.7 0.12
TSH4 Sunny 6.5 <2 3.3 0.86
Date of sample taken : 22/5/2023
TSH1 Sunny N/A (3) <2 6.5 0.09
TSH2 Sunny N/A (3) <2 9 0.13
TSH3 Sunny 7 3.5 3.3 0.39
TSH4 Sunny 12 9.3 5 0.47
Date of sample taken : 2/6/2023
TSH1 Sunny N/A (3) <2 6.1 0.087
TSH2 Sunny N/A (3) <2 24 0.11
TSH3 Sunny 16 <2 3.6 0.077
TSH4 Sunny 8.5 <2 8.2 0.066
Date of sample taken : 20/6/2023
TSH1 Sunny N/A (3) 13 8.1 0.074
TSH2 Sunny N/A (3) 21 (4) 24 0.37
TSH3 Sunny <5 <2 4.4 0.057
TSH4 Sunny <5 <2 4.8 0.057
Date of sample taken : 10/7/2023
TSH1 Sunny N/A (3) <2 50 (4) 0.011
TSH2 Sunny N/A (3) <2 42 (4) 0.082
TSH3 Sunny <5 <2 <3 <0.01
TSH4 Sunny <5 <2 <3 <0.01
Date of sample taken : 21/7/2023
TSH1 Sunny N/A (3) <2 7 0.068
TSH2 Sunny N/A (3) <2 13 0.066
TSH3 Sunny <5 <2 <3 0.015
TSH4 Sunny <5 <2 <3 <0.01
Date of sample taken : 9/8/2023
TSH1 Cloudy N/A (3) <2 23 0.072
TSH2 Cloudy N/A (3) <2 16 0.046
TSH3 Cloudy 8.2 <2 <3 0.037
TSH4 Cloudy 8.9 <2 12 0.015
Date of sample taken : 23/8/2023
TSH1 Sunny N/A (3) <2 12 0.052
TSH2 Sunny N/A (3) 4.5 28 0.38
TSH3 Sunny <5 <2 <3 <0.01
TSH4 Sunny <5 <2 <3 <0.01
Referencing water quality standards (2)

80 

20

30

5

 

Remarks :

  1. No water quality monitoring point at Tai Shui Hang is required under the WENT Landfill's Contract. If there is any abnormal change in the water quality, EPD will take follow-up actions.
  2. The water quality standards at Tai Shui Hang are not specified under the WENT Landfill's Contract. The referencing water quality standards in the above table are referred to the Technical Memorandum under Water Pollution Control Ordinance (Cap. 358AK).
  3. At the time of sampling, this location was intruded by marine water. Since the chloride in marine water would have interference with the measured level of chemical oxygen demend, the level of chemical oxygen demend at this location was not measured.
  4. Stirred up bottom sediment at the interface of marine and river water at river mouth shores during sampling resulted into interference with the reporting parameters that was not measured or their slightly elevated content.

 

 

EPD staff obtains a water sample from Tai Shui Hang (TSH3)

EPD staff obtains water sample from Tai Shui Hang (TSH3)

Upstream of Tai Shui Hang (TSH4)

Upstream of Tai Shui Hang
 
 

 

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