RAND WATER ANNUAL REPORT 2023

HOW WE CREATE VALUE

Customer Bulk Water Quality Report Table: 10: Customer Bulk Water Quality Report Customer Bulk Distribution water quality report: 22 June 2022 to 22 June 2023 Determinands Measurement Units Risks

SANS 241:2015 standard limits (1)

No of results

Required compliances to SANS 241:2015 spec (%)

Achieved compliances to SANS 241:2015 spec (%)

Microbiological determinands E. coli

(mpn per

Acute health

Non-detect

11 208

99.0%

99.90%

100 mL) (mpn per

Total Coliforms

Operational

≤ 10

11 208

95.0%

99.56%

100 mL)

Heterotrophic Plate Count Cryptosporidium spp (2)

(cfu per 1 mL) (org / 10 Litre) (org / 10 Litre)

Operational Acute health Acute health Operational

≤ 1000

14 481

95.0% 99.0% 99.0% 95.0%

99.70%

Non-detect Non-detect Non-detect

225 224

100% 100% 100%

Giardia spp (2)

Somatic Coliphages (2)

(count per

1 156

10 mL)

Physical and Aesthetic determinands Colour

(mg / L as Pt-Co) (mS / m)

Aesthetic

≤ 15

1 547

95.0%

98.64%

Conductivity

Aesthetic Aesthetic

≤ 170

8 845 1 228

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

100% 100%

Total Dissolved Solids

(mg / L)

≤ 1200

Turbidity Turbidity

(NTU) (NTU)

Operational

≤ 1 ≤ 5

11 214 11 214

98.91% 99.92%

Aesthetic

pH

(pH units)

Operational

≥ 5 to ≤ 9.7

8 910

100%

Chemical Properties: Macro determinands Ammonia

(mg / L as N) (mg / L as Cl)

Aesthetic Aesthetic

≤ 1.5 ≤ 300

10 346

100% 100% 100% 100% 100% 100% 100% 100%

Chloride

1 348

(mg / L as Cl 2 ) Chronic health

≤ 5

14 481 10 484

Free chlorine

(mg / L as Cl 2 ) (mg / L as F) (mg / L as N) (mg / L as N) (mg / L as N) (mg / L as Cl 2 ) (mg / L as Na) (mg / L as SO 4 ) (mg / L as SO 4) (mg / L as Zn)

Chronic health Chronic health Acute health Acute health Acute health

≤ 4.1 ≤ 1.5 ≤ 11 ≤ 0.9

Monochloramine

Fluoride Nitrate

1 334

10 324 10 333 10 179

Nitrite

Combined nitrate plus nitrite (3) Residual disinfectant (4)

≤ 1

Operational

≥ (0.1 and 0.2)

14 481

92.64%

Sodium Sulphate Sulphate

Aesthetic Aesthetic

≤ 200 ≤ 250 ≤ 500

1 360 1 387 1 387 1 361 1 361 1 243 1 289 1 361

100% 100% 100% 100%

Acute health

Zinc

Aesthetic

≤ 5

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

Operational

≤ 300

99.93%

Antimony

(µg / L as Sb) (µg / L as As) (µg / L as Ba)

Chronic health Chronic health Chronic health

≤ 20 ≤ 10

100% 100% 100%

Arsenic Barium

≤ 700

119