16-18 February 2023

Water Quality

Sample Site7th Feb 202214th Feb 202217th Feb 202221st Feb 202228th Feb20227th Mar 2022
Msunduzi at Caluza bridge866408164011199054750111990
Msunduzi d/s of Kwapata14136092080727006488092080
Msunduzi at Edendale weir bh Prison1119901046206131057940111990
Slangspruit u/s of Msunduzi confluence26130042600241960344100435200
Msunduzi at Camps Drift bridge14136098040241960209800178900
Msunduzi u/s of Dorpspruit confluence38730160010462686714136
Dorpspruit at polo fields1529023192081607092080
Townbush stream at polo fields1860032301203319350111990
Dorpspruit Ohrtmann Road186001750920811000141360
Msunduzi u/s of Refuse Dump41060121012033410617329
Msunduzi u/s of Darvill WWW3076019350104300387308164038730
Msunduzi u/s of Baynespruit387301334030900410607270030760
Baynespruit at Greytown road98040129970104620196800387300
Baynespruit at Sobantu8664010462046200155310210500275500
Msunduzi u/s of Darvill Maturation river770103044075900461107701057940
Darvill final effluent1203361312187415
Duzi d/s of Darvill Mat river8664061310
Msunduzi at Motorcross980401515054500517207270048840



DUCT’s River Water Quality Assessment Guidelines updated 27 October 2013

E. coli bacteria occur naturally within mammal digestive systems and most of them are not harmful in any way. However, because they are so common E. coli data are considered useful as a general indicator of a wide range of other potential human pathogens, and thus also of the possible presence of sewage related water quality problems. In the absence of other data, E. coli numbers are useful in allowing a general assessment of other potential water quality risks.

E. coli count/100mL
Water quality “assessment”
Assessment of probable risk to canoeists

*0 – 130
  WaterExcellent Excellent – Considered acceptable for full contact recreation – excellent / likely natural catchment.
Extremely low risk.

130 – 1000
WaterGood Good – within the range expected for quite good catchment conditions, but significant / increasing risk of illness if used for full contact recreation (e.g. swimming). Very low risk.

1001 – 4000
WaterFair Fair resource condition, natural sources (i.e. not sewage related) are still possibly the E. coli source, but increasing likelihood of human faecal / sewage contamination at the upper end of this range. Unacceptable for swimming. Low, but increasing risk.

4 001 – 10 000
WaterPoor Degraded – Significant faecal input or some sewage contamination is indicated. Other water quality parameters are likely to be poor.
Moderate risk (approx. 1 in 10 may get sick).

10 001 – 25 000
WaterVeryPoor Unacceptably Poor, sewage contamination definitely present.
Moderately high canoeing risk (approx. 1 in 5 may get sick) – some likelihood of illness esp. in white water.

25 001 – 50 000
WaterDangerous Bad, with significant sewage contamination and negative environmental consequences.
High risk (approx. 1 in 3 may get sick) – consider not canoeing or paddle on flat water only, with no risk of falling out.

>50 000
WaterVeryDangerous Severely contaminated with significant sewage contamination and negative environmental consequences.
Very High canoeing risk – (approx. 1 in 2 paddlers may get sick). Avoid canoeing!

*Note, the only acceptable value for drinking water quality is ZERO E.coli counts per 100 mℓ. No naturally occurring surface water should be expected to have E. coli this low (even in large dams). If zero E. coli results are achieved for a natural water, contamination by disinfectants is the likely cause and this may be masking other significant potential pollutants.