Rand Water | Integrated Annual Report 2025

Customer Bulk Distribution water quality report: 21 June 2024 to 20 June 2025 Determinands Measurement Units Risks SANS No of results

Required compliances

Achieved compliances

241:2015 standard limits (1)

to SANS 241:2015 spec (%)

to SANS 241:2015 spec (%)

Sulphate

(mg / L as SO 4 ) (mg / L as Zn)

Acute health

≤ 500

1 385 1 366

99.0% 95.0%

100,00% 100,00%

Zinc

Aesthetic

≤ 5

Chemical Properties: Micro determinands Aluminium (µg / L as Al)

Operational

≤ 300

1 514 1 253 1 296 1 366 1 245 1 296 1 366 1 366 1 292 1 570 1 570 1 296 1 561 1 561 1 296 1 366 1 296 1 253 1 421 1 155 1 474 1 474 1 474

95.0% 97.0% 97.0% 97.0% 97.0% 97.0% 97.0% 97.0% 99.0% 97.0% 95.0% 97.0% 97.0% 95.0% 97.0% 97.0% 97.0% 97.0% 97.0% 95.0% 97.0% 97.0% 97.0%

99,74% 100,00% 100,00% 100,00% 100,00% 100,00% 100,00% 100,00% 100,00% 100,00% 99,87% 100,00% 100,00% 99,62% 100,00% 100,00% 100,00% 100,00% 100,00% 100,00% 100,00% 100,00% 100,00%

Antimony

(µg / L as Sb) (µg / L as As) (µg / L as Ba) (µg / L as B) (µg / L as Cd) (µg / L as Cr) (µg / L as Cu) (µg / L as CN) (µg / L as Fe) (µg / L as Fe) (µg / L as Pb) (µg / L as Mn) (µg / L as Mn) (µg / L as Hg) (µg / L as Ni) (µg / L as Se) (µg / L as U)

Chronic health ≤ 20 Chronic health ≤ 10 Chronic health ≤ 700 Chronic health ≤ 2400 Chronic health ≤ 3 Chronic health ≤ 50 Chronic health ≤ 2000

Arsenic Barium

Boron

Cadmium

Chromium (Total)

Copper

Cyanide (Recoverable)

Acute health

≤ 200

Iron Iron

Chronic health ≤ 2000

Aesthetic

≤ 300

Lead

Chronic health ≤ 10 Chronic health ≤ 400

Manganese Manganese

Aesthetic

≤ 100

Mercury

Chronic health ≤ 6 Chronic health ≤ 70 Chronic health ≤ 40 Chronic health ≤ 30

Nickel

Selenium Uranium

Organic determinands Total Organic Carbon

(mg / L) (µg / L) (µg / L) (µg / L) (µg / L)

Chronic health ≤ 10

Phenols as C 6 H 5 OH Chloroform - CHCl 3 Bromoform - CHBr 3

Aesthetic

≤ 10

Chronic health ≤ 300 Chronic health ≤ 100 Chronic health ≤ 100

Dibromochloromethane - CHBr 2 Cl Bromodichloromethane - CHBrCl2 Combined trihalomethanes (5)

(µg / L)

Chronic health ≤ 60

1 474

97.0%

99,86%

(µg / L)

Chronic health ≤ 1

1 473

97.0%

95,99%

Total Microcystin (2)

(µg / L)

Chronic health ≤ 1

248

97.0%

100,00%

For monitoring/reporting purposes only Calcium (6) (mg / L as Ca)

Aesthetic

≤ 150

1 366 not applicable 100,00%

Hardness (7) Magnesium (6) Potassium (6)

(mg / L as CaCO 3 ) Operational

≥ 20 to ≤ 200

1 365 not applicable

97,07%

(mg / L as Mg) (mg / L as K)

Aesthetic Aesthetic

≤ 70 ≤ 50

1 366 not applicable 100,00% 1 366 not applicable 100,00%

Rand Water Risk Determinands (RWRD) (6) Odour TON

RWRD RWRD

≤ 2 ≤ 2

3 783 3 783

not applicable not applicable

100% 100%

Taste

FTN

148

Rand Water | Integrated Annual Report 2025