WATER QUALITY INFORMATION

1. Water Treatment Works Capacity, Condition and Water Quality Produced

Umgeni Water treats water at seventeen (17) bulk water treatment works, for which works capacities and utilisation are shown in Figures 1.1 and 1.2 respectively. Water quality produced per water treatment works is shown in Table 1.1.

Figure 1.1: Water Treatment Works Design Capacity (Ml/d).

Figure 1.2: Water Treatment Works Capacity Utilisation.

Table 1.1: Water quality produced per water supply system for the period (as at December 2018)

Water Supply System Average Daily Volume Treated (Ml/d) % Total Supply Volume Per cent Compliance with SANS 241:2015
Acute Health Microbiological Acute Health  Chemical Chronic  Health Chemical Operational Aesthetic
Heights WTW 439.0 41.39 100.00 100.00 100.00 100.00 100.00
Wiggins WTW 268.9 23.59 100.00 100.00 100.00 99.68 100.00
Water Supply System 227.5 16.85 100.00 100.00 100.00 99.63 100.00
Harris Water Supply System 78.5 7.41 99.59 100.00 100.00 99.66 100.00
Hazelmere Water Supply System 37.5 5.06 100.00 100.00 99.74 99.86 100.00
Amanzimtoti Water Supply System 15.0 1.62 100.00 100.00 100.00 99.66 99.89
Thukela Supply System     100.00 100.00 99.74 99.54 100.00
WTW 11.9 0.81 100.00 100.00 100.00 100.00 100.00
Mtwalume WTW 10.3 0.51 100.00 100.00 100.00 100.00 100.00
Maphumulo Water Supply System 5.0 0.40 100.00 100.00 99.58 99.73 99.12
Maphephetheni WTW 3.25 0.27 100.00 100.00 100.00 100.00 100.00
Ixopo WTW 1.6 0.22 100.00 100.00 100.00 100.00 100.00
Mhlabatshane WTW 3.5 0.27 100.00 100.00 100.00 99.39 100.00
uMgungundlovu Schemes 6.95 0.63 100.00 100.00 100.00 98.72 100.00

2. Summary of Interventions to address Capacity and Water Quality Constraints

Several works, as shown in Figure 1.2 are currently operated above their design capacity in response to demands and this also impacts on water quality. Specific interventions to address this in the five-Year Corporate Plan period including some associated raw water supplies are:

  • Mgeni System – Midmar WTW: A works upgrade is currently underway and is scheduled to be completed during 2019.
  • Mtwalume WTW: Operational and process enhancements will alleviate constraints. The load on the Mtwalume system will be shed to the South Coast Pipeline when the Pennington Link is completed by Ugu DM. The long-term solution to address the Mtwalume capacity constraints is the extension of the South Coast Pipeline and related system, which will coincide with the commissioning of the Lower uMkhomazi Bulk Water Supply Scheme in 2023.
  • Ixopo System: Umgeni Water provides bulk potable water to the town of Ixopo from a 2.8 Ml/day Water Treatment Works (WTW), supplemented with a 0.4 Ml/day borehole.
  • Mhlabatshane System: A detailed feasibility study for Phase 2 (augmentation from the uMzimkhulu River) of this regional supply scheme has been completed and this project will now progress to the Detailed Design level.
  • Mgeni System – Lower uMkhomazi Bulk Water Supply Scheme: A detailed feasibility study has been completed on this project and a detailed design of the scheme will now be undertaken.
  • Hazelmere WTW: The Dam Wall Raising project is currently underway. This will increase the dam capacity from 17.18 million m3 to 36.1 million m3.
  • Maphumulo System: The upgrade the WTW from 6 Ml/d to 12 Ml/d is in progress. Construction is in progress and is expected to be complete by 2020.

3. Water Quality Management Plan

Umgeni Water is committed to providing all its customers with safe potable water which is suitable for lifetime consumption as required by legislation. This is achieved through implementing a rigorous water quality management programme throughout the supply system. This includes carefully planned monitoring programmes, system audits and compliance reporting and water quality assessments – conducted using a catchment to consumer approach and governed by the implementation of Water Safety Plans. This in turn ensures that all existing Blue Drop certifications for bulk sites are maintained. Umgeni Water is committed to supporting municipalities to progressively improve all systems toward joint Blue Drop Certification.

Monitoring programmes are reviewed each year in accordance with legislative requirements, customer bulk supply agreements, requirements for water treatment processes and in accordance with water quality risks previously identified in the system. Umgeni Water continually reviews water quality risks associated with abstraction, conveyance, treatment and bulk distribution to ensure the effectiveness of controls is maintained and that water quality is assured. All operational sites are equipped with an Incident Management Protocol aligned to SANS 241: Drinking Water Specification.

Sampling and analysis is currently undertaken in accordance with an ISO 9001 certified monitoring programme and SANAS 17025 Accredited laboratory methods. Umgeni Water will endeavour to maintain its certification and accreditation status through on-going quality assurance processes.

The calculation and reporting of potable water quality compliance is in accordance with the requirements of the SANS 241: 2015 drinking water specification. Performance is assessed against five risk categories:

(1) Acute Health Microbiological,
(2) Acute Health Chemical,
(3) Chronic Health Chemical,
(4) Aesthetic, and
(5) Operational categories.

Information on water quality performance is conveyed as per communication plan to all customers, stakeholders and legislative decision makers

Blue Drop Certification Trends for KZN Municipalities
The KZN Province has fourteen (14) Water Services Authorities providing water supply through 209 systems. Of the 209 systems, 67 are operated by water utilities: Umgeni Water (31), Mhlathuze Water (2) and uThukela Water Company (34).

The provincial Blue Drop score decreased from 92.1% in 2012 to 86.1% in 2014 (by 6%). Furthermore 61 systems have a Blue Drop score below 50% compared to 19 in 2012, while 18 water supply systems are in crisis achieving scores below 31%. The Blue Drop certified systems halved from 16 to 8. Table 1.2 shows the Provincial performance trends for the period 2009 to 2014.

Table 1.2 Provincial performance trends from 2009 to 2014 (source DWS)

Services Authority 2009 2010 2011 2012 2014
Msunduzi Local Municipality N/A 73% 96% 95% 98%
eThekwini Metropolitan Municipality 97% 96% 96% 99% 96%
uMgungundlovu District Municipality 21% 65% 56% 92% 90%
City  of uMhlathuze Local Municipality N/A 80% 89% 93% 90%
Newcastle Local Municipality 71% 75% 76% 97% 89%
iLembe District Municipality 100% 51% 86% 88% 87%
uMzinyathi District Municipality 80% 66% 70% 93% 78%
uThungulu District Municipality 78% 37% 71% 73% 74%
District Municipality 94% 87% 93% 93% 66%
Harry Gwala District Municipality 34% 54% 40% 69% 63%
Amajuba District Municipality 68% 56% 84% 83% 58%
uMkhanyakude District Municipality N/A 22% 32% 78% 58%
Zululand District Municipality 92% 60% 72% 83% 51%
uThukela District Municipality 55% 54% 55% 57% 35%

4. Wastewater Treatment Works Capacity, Condition and Effluent Quality

Umgeni Water treats wastewater at nine (9) Wastewater Treatment Works of varying sizes and complexities, ranging from 0.5 Ml/d to 75 Ml/d (Figures 1.3 and 1.4). Effluent quality achieved also varies (Table 1.3) largely associated with infrastructure condition and capacity. Several infrastructure upgrade/expansion projects and one new infrastructure development project are being planned or implemented during this Corporate Plan period. Information per works is provided in the section that follows.

Table 1.3: Wastewater Compliance

Wastewater Treatment Works Design Capacity Ml/d July 2018– December 2018 2014 Green Drop Risk Rating
Darvill 75.0 66.52% 65.6% (↓)
Howick 6.8 91.74% 54.5% (↑)
Mpofana 3.5 82.58% 64.7% (↑)
Ixopo 1.0 91.11% 52.9% (↑)
Richmond 1.0 93.33% 47.1% (↑)
Cool Air 1.0 99.23% 29.4% (↓)
Lynnfield Park 0.5 90.74% 52.9% (↑)
Camperdown 0.5 91.67% 52.9% (↑)
Appelsbosch 0.5 80.56% 23.5% (↓)

5. Wastewater monitoring and water quality management

Water quality monitoring programmes are developed and implemented to ensure sites are covered and programmes aligned to risk-based methodology that yields reliable information for treatment mitigation.

Sampling and laboratory analysis are undertaken in accordance with the organisation’s ISO 9001 certified monitoring programme and SANAS 17025 Accredited laboratory.

Alert levels are categorised in terms of levels, with 0 as the lowest level - indicates no issues and 3 as the highest level – indicating there is high likelihood of an impact.

Implementation of monitoring programmes, alert level response protocols and development of action plans in response to directives helps ensure systems deliver safer quality effluent that benefits all downstream uses including vulnerable communities.