Henley Standard 26/February




 

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The Loddon near Wargrave Sewage Treatment Works 19/June/2026

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On the 19th June we did a boat trip up the Loddon to near where Wargrave Sewage Treatment Works discharges “treated” sewage. There had been little recent rain, so it is probable that the sewage works were working normally.  The first sample was taken just upstream of the sewage discharge point. This sample would include water from the Loddon and St Patrick’s stream. ⬇️ Small amount of E.coli detected. The next sample was taken a few metres downstream, at the discharge point. ⬇️  E.coli reading = TNTC = too numerous to count. The final sample was taken just before the Loddon joins the Thames. ⬇️ At 6266 cfu/100ml E.coli reading still very high. (Environment Agency advise against swimming if reading is greater than 900 cfu/100ml) An additional sample was also taken on the Thames, just upstream of Shiplake Lock.⬇️ We generally find little or no E.coli here. I swim here.
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Why SWIM in HoTWater?

  SWIM refers to Shiplake and Wargrave Indicative Monitoring (of E.coli in the river) which is associated the HoTWater group . It’s just a light hearted name for a dirty topic. Hopefully, one day, we will be able to SWIM in clean water.
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Demo photo

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 The following photo is of a R-Card of unknown origin. It is included for demonstration purposes only. Each blue dot indicates the presence of E.coli in a 1 ml sample      row 1 = 1      row 2 = 12      row 3 = 49      row 4 = 43      row 5 = 45      row 6 = 13 total = 163 Because the accepted unit of measurement is colony forming units of E.coli per 100 ml sample, we multiply 163 x 100 giving 16300 cfu/100ml  In practice we will be examining 3 cards for each test and recording the mean/average of the 3 cards. Because 16300 is greater than 900 the Environment Agency would classify this sample as "poor", and advise against swimming. Me too ( I hope samples from the Thames are not a polluted as this ).
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