PORTABLE WATER FOR HOUSEHOLDS & INDUSTRIES
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Water Quality and Treatment.

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The standard for drinking water produced by Port Harcourt Water Corporation is based on the Nigerian Standard for Drinking Water Quality (NSDWQ), regulated by the Standards Organisation of Nigeria (SON CAP 412) and also conforms to World Health Organisation (WHO) Guideline for drinking water quality 3rd edition 2004.

Nigerian Standard for Drinking Water Quality contains mandatory limits concerning constituents and contaminants of water that are known to be hazardous to health and/or give rise to complaints from consumers. The standard includes a set of procedures and good practices required to meet the mandatory limits.

In 2005, the National Council on Water Resources (NCWR) recognized the need to urgently establish acceptable Nigerian Standard for Drinking Water Quality because it was observed that the “Nigerian Industrial Standard for Potable Water” developed by Standards Organisation of Nigeria and the “National Guidelines and Standards for Water Quality in Nigeria” developed by Federal Ministry of Environment did not receive a wide acceptance by all stakeholders in the country. Since water quality issues are health related issues, the Federal Ministry of Health, collaborating with the Standards Organisation of Nigeria (the only body responsible for developing National Standards in Nigeria) and working through a technical committee of key stakeholders developed the Nigerian Standard for Drinking Water Quality (NSDWQ).

Analytical Parameters

The table below shows the analytical parameters for which raw water is tested by the Port Harcourt Water Corporation Water Quality Control laboratory before it can be rendered consumable. The table also shows the unit of measurement for each parameter, the maximum limit as dictated by World Health Organization and Nigerian Standard for Drinking Water Quality and the health implications.

S/N

PARAMETERS

UNITS

PARAM_CATEGORY

WHO

NSDWQ

HEALTH_IMPACT

1

Temperature

Celsius

Physical

Ambient

nil

2

PH

Physical

Elevated levels of toxic metals, Eye  and
Skin irritation

3

Total Coliform Count

cfu/ml

Biological

3

10

indication of fecal contamination

4

E-Coli

nil

Biological

0

0

nil

5

 Total Dissolved Solids(TDS)

mg/l

chemical

1000

500

nil

6

Total Suspended Solids(TSS)

mg/l

chemical

0

0

nil

7

Alkalinity

mg/l as CaCO3

chemical

0

0

nil

8

Nickel

mg/l

chemical

250

250

Possible carcinogenic

9

Conductivity

?s/cm

chemical

1000

1000

nil

10

Fluoride(F-)

mg/l

chemical

2

2

fluorosis. skeletal tissue(bones and teeth)
morbidity

11

Iron(Fe+2)

mg/l

chemical

0

0

nil

12

Magnesium Hardness (MgCO3)

mg/l

chemical

0

0

nil

13

NaCl

mg/l

chemical

0

0

nil

14

Nitrate(NO3)

mg/l

chemical

50

50

Cyanosis. and asphyxia (‘blue-baby
syndrome’) infants under 3 months

15

pH

100ml Sample @25OC

chemical

0

0

nil

16

Total Hardness as CaCO3

mg/l

chemical

0

0

nil

17

Aluminium(Al)

mg/l

chemical

0

0

potential neuro-degenrative disorders

18

Zinc(Zn)

mg/l

chemical

0

0

nil

19

Turbidity

NTU (Nephelometric Turbidity Units)

physical

5

5

nil

20

Ammonia

mg/l

Chemical

0

0

Skin, Eye, Nose and Throat irritation

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