Percentage of the Water Quality Categories According to Sampling Sites on the Monitored Watercourses
 

Water category		A		B		C		D		E		F
according to the STN	year	oxygen demand indicators		basic chemical indicators		additional chemical		heavy metals indicators		biological and microbiological		radioactivity indicators
75 7221						indicators				indicators
standard		Number*	%	Number*	%	Number*	%	Number*	%	Number*	%	Number*	%
	1993	0	0	0	0	50	17.2	16	9.9	0	0	11	36.7
	1994	0	0	0	0	48	21	3	3	0	0	6	32
I	1995	0	0	0	0	54	22.5	3	3	0	0	5	35.7
	1996	0	0	0	0	51	20.9	2	1.9	0	0	2	11.1
	1997	0	0	0	0	63	24.2	6	5.6	0	0	2	7.2
	1993	80	27.5	0	0	75	25.8	55	34	6	2.1	16	53.3
	1994	74	32	0	0	66	28	26	29	0	0	7	37
II	1995	114	47.5	0	0	65	27.1	34	34.4	2	0.8	5	35.7
	1996	95	39	0	0	66	27	26	24.8	1	0.4	12	66.7
	1997	94	36.2	0	0	75	28.8	25	23.1	1	0.4	20	71.4
	1993	117	40.2	52	17.9	36	12.4	51	31.5	45	15.5	1	3.3
	1994	96	41	50	22	33	14	35	39	33	14	4	21
III	1995	84	35	114	47.5	29	12.1	17	7.2	22	9.2	2	14.3
	1996	105	43	107	43.8	28	11.5	12	11.4	20	8.2	4	22.2
	1997	108	41.5	112	43.1	39	15	18	16.7	22	8.5	6	21.4
	1993	36	12.4	61	21	91	31.3	22	13.6	70	24.1	2	6.7
	1994	31	13	53	23	63	27	15	16	53	23	2	10
IV	1995	29	2.1	74	30.8	62	25.8	21	21.2	119	49.6	2	14.3
	1996	32	13.1	79	2.4	73	29.9	38	36.2	93	38.1	0	0
	1997	43	16.5	70	26.9	62	23.9	40	37	99	38.1	0	0
	1993	58	19.9	178	61.2	39	13.4	18	12.4	170	58.4	0	0
	1994	31	13	129	55	22	10	12	13	146	63	0	0
V	1995	13	5.4	52	21.7	30	12.5	24	24.2	97	40.4	0	0
	1996	12	4.9	58	23.8	26	10.7	27	25.7	130	53.3	0	0
	1997	15	5.8	78	30	21	8.1	19	17.6	138	53	0	0
	1993	291	100	291	100	291	100	162	100	291	100	30	100
	1994	232	100	232	100	232	100	91	100	232	100	19	100
Total	1995	240	100	240	100	240	100	99	100	240	100	14	100
	1996	244	100	244	100	244	100	105	100	244	100	18	100
	1997	260	100	260	100	260	100	108	100	260	100	28	100