WHAT TO EXPECT FROM SANS 241:2015

RAND WATER RIETVLEI INDABA AUDITORIUM

Mapula Mametja18 February 2015

OVERVIEW WATER LAWS IN SA

CURRENT SANS (2006 OR 2011?)

COMPARISONS OF SANS, BLUE DROP LIMITS AND RAND WATER PRODUCTION SPEC

SANS 241: 2015

PRESCRIBED WATER QUALITY MONITORING PROGRAMME

CHANGING DETERMINANDS IN DISTRIBUTION

CONCLUSION

WaterTreatment

Distribution Use

What is “Water Services”?

Management and customer interface and services

Surface and ground water

Abstraction

Treated &untreateddischarges

Water use efficiency and demand management (No Drop)

Diffusepollution

Non-reticulated systems (e.g. on-site “dry” sanitation)

Re-use

WastewaterTreatment

Collection

= Key interfaces between the resource and the services

National Water Act, 36 of 1998

Water Services Act, 108 of 1997

Water Laws in South Africa-

WaterTreatment

Distribution Use

What is “Water Services”?

Management and customer interface and services

Surface and ground water

Abstraction

Treated &untreateddischarges

Water use efficiency and demand management (No Drop)

Diffusepollution

Non-reticulated systems (e.g. on-site “dry” sanitation)

Re-use

WastewaterTreatment

Collection

= Key interfaces between the resource and the services

National Water Act, 36 of 1998

Water Services Act, 108 of 1997

Water Laws in South Africa-

• Regulations under s9: Compulsory National Standards for Quality Water Services

basic water supply, interruption in provision of water services, disposal of grey water, repair of leaks, quality of potable water - refers National Standard for Drinking Water (SANS) 241)

SANS 241: 2006 vs SANS 241:2011 DWS assessed WSI using Blue Drop

Limits Developed from both SANS 241:2006

and 2011 Less stringent limit was considered -

2014 Blue Drop Limits 2014 Blue Drop limits – 2013 Audits 2015 Blue Drop limits – PAT assessment SANS 241:2015 (2016 Audit?)

Comparison between SANS 241 Limits and Blue Drop Limits

Comparison between SANS 241 Limits, Blue Drop Limits and Rand Water Production limits

SANS 241:2015Part 1: Definition of safe drinking water quality requirements for humans.

Part 2: Definition of water quality management system requirements (Application of SANS 241-1)

SANS 241-2Part 2: Application of SANS 241-1

Key elements for management actions1. water quality risk assessment – assessment of

risk from intake water to point of delivery

2. routine monitoring – establishment and implementation of operational & compliance (location of sampling points, frequency & determinands)

3. response monitoring – incident management / monitoring of DWQ following non-compliance

4. verification of water quality – calculate compliance with numerical limits; &

5. water safety planning – address outcomes of above

minimum requireme

nts

SANS 241-2: PRESCRIBED WATER QUALITY MONITORING PROGRAMME

Table 2 — Minimum sample numbers for E. coli (or faecal coliforms) in water supply systems

1 2

< 5 000 2

5 000 to 100 000 1 per 5 000 head of population + additional sample

100 000 to 500 000 1 per 10 000 head of population + 11 additional samples

≥ 500 000 1 per 20 000 head of population + 36 additional samples

Population served

a During the rainy season, sampling should be carried out more frequently to ensure that all spatial and temporal risksare identified.

Total number of samples per montha

Minimum

Annual risk assessment risk defined monitoring programme (table 3)

Table 1 SANS241-2 default risk determinands which will also form part of

risk defined monitoring programme

SANS 241-2WATER QUALITY MONITORING PROGRAMME

Table 3 — Frequency of analyses for determinands identified during the risk assessment exceeding the numerical limits in

SANS 241-1

1 2 3 4

Risk Raw Water Final Water Critical distribution System points

Acute health Bacteriological risk determinands

see table 1 see table 1 see table 2

Protozoan Parasite risk determinands Not applicable Monthly

Acute health Chemical risk determinands

Weekly Weekly Monthly

Chronic health risk determinands Monthly Monthly Monthly

Aesthetic risk determinands Monthly Monthly Quarterly

Operational risk determinands Weekly Weekly Monthly

Frequency

a Aluminium should be monitored on the final water in accordance with table 1 and monthly on distribution system

DETERMINANDS THAT CAN CHANGE IN THE DISTRIBUTION NETWORK

Reasons that can lead to the deterioration:– Addition of chemicals– Leaching from pipe lining– Leaks – Regrowth inside the pipe etc.

Deteminands that can change

Frequency of monitoring as per table 3

CONCLUSION

SANS 241:2015 determinands limits - relaxed/more stringent

Full SANS – annually ( 45 determinands)– Protozoa to be monitored if final water indicated

positive results– Total Microcystin to be monitored if there is algal

bloom in raw water New determinands = 18 Removed determinands = 9 Current monitoring to be aligned with SANS

241 requirements

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