Groundwater quality, 5. page

Groundwater quality

Nitrate, chloride, sulphate in groundwater in 1997:

Indicator NO₃ Cl SO₄

Limit (according to STN 75 7111) 50 mg/l 100 mg/l 250 mg/l

Number of measurements 292 292 292

Number of limit overruns (%) 17 16 14

Source: SHMÚ

Pesticide in groundwater in 1997:

Indicator DDT Heptachlor HCB HCH Methoxychlor

Limit (according to STN 75 7111) 10 ng/l 100 ng/l 10 ng/l 0.003 mg/l 0.03 mg/l

Number of measurements 21 21 21 21 21

Number of limit of overruns 0 0 3 0 0

Source: SHMÚ

Maps:

Concentrations of COD in groundwater in the SR
Concentrations of CL in groundwater in the SR
Concentrations of Fe in groundwater in the SR
Concentrations of phenols in groundwater in the SR
Concentrations of Mn in groundwater in the SR
Concentrations of extractable non-polar substances (ENP) in groundwater in the SR
Concentrations of NH₄⁺ in groundwater in the SR
Concentrations of NO₂^- in groundwater in the SR
Concentrations of NO₃^- in groundwater in the SR
Concentrations of SO₄^2- in groundwater in the SR

Indicator	NO₃	Cl	SO₄
Limit (according to STN 75 7111)	50 mg/l	100 mg/l	250 mg/l
Number of measurements	292	292	292
Number of limit overruns (%)	17	16	14

Indicator	DDT	Heptachlor	HCB	HCH	Methoxychlor
Limit (according to STN 75 7111)	10 ng/l	100 ng/l	10 ng/l	0.003 mg/l	0.03 mg/l
Number of measurements	21	21	21	21	21
Number of limit of overruns	0	0	3	0	0