A: gallai dileu'r fflworid, arsenig, copr, sinc, arwain a ffosffadau o'r dŵr.

{$*$12$*$}

{$*$13$*$}

1-2

2-3

3-5

{$*$14$*$}

%

≥93

≥93

≥93

{$*$15$*$}

%

≤0.10

≤0.10

≤0.10

{$*$16$*$}

%

≤0.04

≤0.04

≤0.04

{$*$17$*$}

%

≤0.30

≤0.30

≤0.30

{$*$18$*$}

{$*$19$*$}

0.7-0.8

0.7-0.8

0.7-0.8

{$*$20$*$}

{$*$21$*$}

≥320

≥320

≥320

{$*$22$*$}

{$*$23$*$}

0.4-0.5

0.4-0.5

0.4-0.5

{$*$24$*$}

{$*$25$*$}

≥50

≥50

≥100

{$*$35$*$}

{$*$36$*$}

{$*$37$*$}

{$*$38$*$}

{$*$39$*$}

{$*$40$*$}

{$*$41$*$}