Water Quality in Maryland
EPA violation data for public water systems across Maryland.
588
ZIP Codes
3,113
Total Violations
225 (38%)
ZIPs with 0 Violations
5.3
Avg per ZIP
National avg: 18.87 violations per ZIP.
Maryland is 72% below average.
Violation Map
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0
1-5
6-15
16+
EPA violations (5yr)
Most Affected Areas in Maryland
All ZIP Codes in Maryland (588)
16720 Oakland
69 21901 Elkton
54 21903 Elkton
54 21740 Hagerstown
51 21042 Columbia
49 21842 Ocean City
47 21015 Abingdon
42 21921 Elkton
38 21078 Abingdon
36 21152 Sparks
36 21117 Owings Mills
35 21702 Frederick
35 21742 Hagerstown
34 20664 La Plata
33 21904 Elkton
33 21911 Elkton
32 15834 Oakland
30 21804 Ocean City
30 20859 Potomac
28 20871 Laurel
28 20833 Laurel
27 20639 Huntingtown
26 21037 Millersville
25 21122 Millersville
25 21811 Ocean City
25 21108 Millersville
22 20646 La Plata
21 21401 Annapolis
21 21639 Greensboro
21 21146 Millersville
20 20602 La Plata
19 21154 Abingdon
19 21157 Westminster
19 20658 La Plata
18 21244 Baltimore
18 21917 Elkton
18 20677 La Plata
17 20778 Millersville
17 21035 Millersville
17 21113 Millersville
17 21866 Tylerton
17 20637 La Plata
16 20711 Millersville
16 20751 Millersville
16 20883 Gaithersburg
16 21050 Abingdon
16 21227 Baltimore
16 21034 Abingdon
15 21771 Laurel
15 21801 Salisbury
15 21851 Ocean City
15 21047 Abingdon
14 21131 Phoenix
14 21230 Baltimore
14 21620 Chestertown
14 21658 Queenstown
14 21666 Stevensville
14 21750 Hagerstown
14 21784 Columbia
14 21795 Hagerstown
14 20662 La Plata
13 21114 Millersville
13 21211 Baltimore
13 21617 Centreville
13 20733 Millersville
12 20772 Hyattsville
12 21028 Abingdon
12 21054 Millersville
12 21057 Glen Arm
12 21237 Baltimore
12 21713 Hagerstown
12 21754 Frederick
12 21930 Elkton
12 15861 Oakland
11 20640 La Plata
11 20695 La Plata
11 20769 Hyattsville
11 21084 Abingdon
11 21085 Abingdon
11 21160 Abingdon
11 21202 Baltimore
11 21404 Annapolis
11 21539 Cumberland
11 21613 Cambridge
11 21632 Cambridge
11 21661 Rock Hall
11 21671 Easton
11 20650 California
10 21012 Millersville
10 21014 Abingdon
10 21087 Abingdon
10 21093 Timonium
10 21208 Baltimore
10 21225 Baltimore
10 21226 Baltimore
10 21231 Baltimore
10 21703 Frederick
10 21830 Salisbury
10 21849 Salisbury
10 21853 Princess Anne
10 21863 Ocean City
10 20622 La Plata
9 20653 California
9 20693 La Plata
9 20754 Millersville
9 20879 Laurel
9 21030 Cockeysville
9 21048 Westminster
9 21111 Abingdon
9 21161 Abingdon
9 21212 Baltimore
9 21220 Baltimore
9 21624 Easton
9 21638 Grasonville
9 21783 Hagerstown
9 21788 Frederick
9 21864 Ocean City
9 21871 Westover
9 20619 California
8 20657 Lusby
8 20670 California
8 20714 Millersville
8 20724 Millersville
8 20736 Millersville
8 21045 Columbia
8 21209 Baltimore
8 21601 Easton
8 21619 Chester
8 21645 Kennedyville
8 21651 Millington
8 21704 Frederick
8 21798 Frederick
8 21822 Ocean City
8 20636 California
7 20785 Hyattsville
7 20794 Millersville
7 21076 Millersville
7 21082 Abingdon
7 21144 Millersville
7 21201 Baltimore
7 21205 Baltimore
7 21206 Baltimore
7 21207 Baltimore
7 21210 Baltimore
7 21213 Baltimore
7 21214 Baltimore
7 21215 Baltimore
7 21216 Baltimore
7 21217 Baltimore
7 21218 Baltimore
7 21222 Baltimore
7 21223 Baltimore
7 21224 Baltimore
7 21228 Baltimore
7 21229 Baltimore
7 21233 Baltimore
7 21234 Baltimore
7 21236 Baltimore
7 21239 Baltimore
7 21251 Baltimore
7 21287 Baltimore
7 21409 Millersville
7 21629 Denton
7 21643 Cambridge
7 21678 Worton
7 21701 Frederick
7 21727 Frederick
7 21737 Columbia
7 21813 Ocean City
7 21841 Ocean City
7 21913 Elkton
7 20764 Millersville
6 20765 Millersville
6 20779 Millersville
6 20854 Laurel
6 21009 Abingdon
6 21013 Abingdon
6 21104 Columbia
6 21120 Parkton
6 21136 Westminster
6 21153 Stevenson
6 21530 Cumberland
6 21545 Cumberland
6 21562 Cumberland
6 21635 Galena
6 21655 Cambridge
6 21663 Easton
6 21757 Frederick
6 21769 Hagerstown
6 21791 Frederick
6 21803 Salisbury
6 21829 Ocean City
6 21850 Salisbury
6 21862 Ocean City
6 21872 Ocean City
6 20601 Hyattsville
5 20613 Hyattsville
5 20616 La Plata
5 20620 California
5 20625 La Plata
5 20634 California
5 20656 California
5 20675 La Plata
5 20685 St. Leonard
5 20735 Hyattsville
5 20759 Columbia
5 20774 Hyattsville
5 20782 Hyattsville
5 20837 Laurel
5 20842 Laurel
5 21032 Millersville
5 21044 Columbia
5 21090 Millersville
5 21163 Columbia
5 21403 Millersville
5 21660 Ridgely
5 21717 Frederick
5 21776 Frederick
5 21797 Laurel
5 21826 Salisbury
5 21915 Elkton
5 21918 Elkton
5 20375 Washington
4 20659 La Plata
4 20660 California
4 20674 California
4 20678 Prince Frederick
4 20701 Millersville
4 20758 Millersville
4 20815 Laurel
4 20878 Laurel
4 21017 Abingdon
4 21060 Millersville
4 21132 Abingdon
4 21204 Towson
4 21221 Essex
4 21716 Frederick
4 21719 Hagerstown
4 21773 Frederick
4 21780 Hagerstown
4 21787 Frederick
4 21861 Salisbury
4 21875 Salisbury
4 21922 Elkton
4 20606 California
3 20609 California
3 20618 California
3 20621 California
3 20624 California
3 20626 California
3 20628 California
3 20630 California
3 20632 La Plata
3 20667 California
3 20680 California
3 20684 California
3 20686 California
3 20687 California
3 20690 California
3 20692 California
3 20755 Millersville
3 20776 Millersville
3 20814 Laurel
3 20861 Laurel
3 20874 Laurel
3 20904 Hyattsville
3 21001 Abingdon
3 21005 Abingdon
3 21010 Abingdon
3 21040 Abingdon
3 21046 Columbia
3 21056 Millersville
3 21061 Millersville
3 21074 Westminster
3 21077 Millersville
3 21088 Lineboro
3 21130 Abingdon
3 21140 Millersville
3 21158 Westminster
3 21240 Millersville
3 21286 Towson
3 21402 Millersville
3 21405 Millersville
3 21520 Accident
3 21677 Cambridge
3 21755 Frederick
3 21777 Frederick
3 21782 Hagerstown
3 21919 Elkton
3 21920 Elkton
3 20607 Hyattsville
2 20689 Sunderland
2 20715 Hyattsville
2 20716 Hyattsville
2 20732 Chesapeake Beach
2 20747 Hyattsville
2 20838 Laurel
2 20877 Laurel
2 20882 Laurel
2 21053 Freeland
2 21102 Westminster
2 21106 Mayo
2 21155 Westminster
2 21543 Cumberland
2 21550 Oakland
2 21557 Cumberland
2 21561 Swanton
2 21623 Church Hill
2 21654 Easton
2 21664 Cambridge
2 21668 Sudlersville
2 21673 Easton
2 21679 Easton
2 21705 Frederick
2 21710 Frederick
2 21714 Frederick
2 21718 Frederick
2 21758 Hagerstown
2 21762 Frederick
2 21770 Frederick
2 21774 Frederick
2 21778 Frederick
2 21790 Frederick
2 21793 Frederick
2 21810 Salisbury
2 21916 Childs
2 21929 Denton
2 20603 La Plata
1 20611 La Plata
1 20612 La Plata
1 20617 La Plata
1 20644 Newburg
1 20645 La Plata
1 20661 La Plata
1 20676 Port Republic
1 20704 Laurel
1 20723 Columbia
1 20763 Columbia
1 20777 Laurel
1 20841 Laurel
1 20852 Laurel
1 20860 Laurel
1 20912 Hyattsville
1 21029 Columbia
1 21036 Columbia
1 21043 Columbia
1 21075 Columbia
1 21481 Annapolis
1 21540 Cumberland
1 21631 Cambridge
1 21711 Hagerstown
1 21722 Hagerstown
1 21723 Columbia
1 21738 Columbia
1 21766 Cumberland
1 21779 Hagerstown
1 21794 Columbia
1 21837 Salisbury
1 21852 Powellville
1 21856 Salisbury
1 21865 Salisbury
1 21902 Elkton
1 21914 Elkton
1