FAHAMU VIWANGO BORA VYA MAJI TANZANIA

Imechapishwa kutoka mitandaoni

                                           Tanzania Standard TZS 789:2008

Released May 2009

Table 1: Microbiological Requirements

Class of Piped Water/ Type of test count	Coliform count per 100 ml at 37 oC	E. Coli (fecal coliform) count per 100 ml at 44 oC
Excellent	0	0
Satisfactory	1 – 3	0
Suspicious	4 – 10	0
Unsatisfactory	More than 10	1 or more

Table 2: Chemical and Physical Limits for Drinking Water Sources

No.	Name of Constituent	Symbol	Units	Limits
	Toxic
1	Lead	Pb	mg/l	0.01
2	Arsenic	As	mg/l	0.05
3	Selenium	Se	mg/l	0.05
4	Chromium	Cr	mg/l	0.05
5	Cyanide	Cn	mg/l	0.20
6	Cadmium	Cd	mg/l	0.05
7	Barium	Ba	mg/l	1.00
8	Mercury	Hg	mg/l	0.001
9	Silver	Ag	mg/l	Not mentioned
	Affecting Human Health
1	Fluoride	F	mg/l	1.5 - 4.0
2	Nitrate	NO3	mg/l	10 - 75
	Organoleptic
1	Color		mg/l	15 - 50
2	Turbidity		mg/l	5 - 25
3	Taste		-	Not objectionable
4	Odor		-	Not objectionable
	Salinity and Hardness
5	pH			6.5 – 9.2
6	Total Filterable Residue		mg/l	500 - 2000
7	Total Hardness	CaCO3	mg/l	500 - 600
8	Calcium	Ca	mg/l	75 - 300
9	Magnesium	Mg	mg/l	50 - 100
10	Magnesium + Sodium sulphate	Mg-Na2	mg/l	500 - 1000
11	Sulphate	SO4	mg/l	200 - 600
12	Chloride	Cl	mg/l	200 - 800
	Less-toxic Metals
13	Iron	Fe	mg/l	1.0
14	Manganese	Mn	mg/l	0.5
15	Copper	Cu	mg/l	3.0
16	Zinc	Zn	mg/l	15.0
	Organic Pollution of Natural Origin
17	BODs( 5 days)	O2	mg/l	6.0
18	PV (Oxygen abs. KMnO4)	O2	mg/l	20
19	Ammonium	NH3	mg/l	2.0
20	Total Nitrogen Exclusive Nitrate		mg/l	1.0
	Organic Pollution Introduced Artificially
21	Surfactants ABS (Alkyl Benxyl Sulphonates)		mg/l	2.0
22	Organic matter as carbon in chloroform extract)		mg/l	0.5
23	Phenolic substances as phenol		mg/l	0.002

Table 3: Radioactive Materials

Material	Limit
Gross alpha activity	0.1 Bq/l
Gross beta activity	0.1 Bq/l