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U.S. Drinking Water by State

Browse drinking water quality data, utility counts, and contaminant concerns for all 50 U.S. states. Data sourced from EPA SDWIS, EPA ECHO, and UCMR 5 federal monitoring records.

50 states·22,516+ utilities tracked·EPA SDWIS · UCMR 5 · EPA ECHO

50 states

			Top contaminants	Report
ALAlabama	470	6.3M	disinfection byproductsnitrates	View report
AKAlaska	98	649K	nitratesnitrates	View report
AZArizona	333	7.2M	arsenicpfashard water	View report
ARArkansas	501	3.0M	disinfection byproductsnitrates	View report
CACalifornia	1,182	36.4M	pfasarsenicdisinfection byproducts	View report
COColorado	423	7.1M	disinfection byproductsleadarsenic	View report
CTConnecticut	121	2.7M	disinfection byproductslead	View report
DEDelaware	79	997K	disinfection byproductsnitrates	View report
FLFlorida	756	21.5M	disinfection byproductsleadnitrates	View report
GAGeorgia	565	10.4M	disinfection byproductsnitratesarsenic	View report
HIHawaii	75	1.5M	disinfection byproductslead	View report
IDIdaho	174	1.5M	arsenicnitrates	View report
ILIllinois	1,134	12.0M	leaddisinfection byproductsnitrates	View report
INIndiana	513	5.2M	disinfection byproductsleadnitrates	View report
IAIowa	498	2.9M	disinfection byproductsarsenic	View report
KSKansas	412	2.8M	disinfection byproductsnitrateslead	View report
KYKentucky	345	5.0M	disinfection byproductsnitrates	View report
LALouisiana	643	5.2M	disinfection byproductsnitrates	View report
MEMaine	121	662K	leadnitrates	View report
MDMaryland	184	5.5M	disinfection byproductslead	View report
MAMassachusetts	328	10.0M	leaddisinfection byproductsnitrates	View report
MIMichigan	667	7.3M	leaddisinfection byproducts	View report
MNMinnesota	492	4.6M	arseniclead	View report
MSMississippi	794	3.1M	disinfection byproductsleadnitrates	View report
MOMissouri	652	5.5M	disinfection byproductsarsenicnitrates	View report
MTMontana	145	701K	disinfection byproductsnitrates	View report
NENebraska	221	1.6M	disinfection byproductsleadnitrates	View report
NVNevada	77	3.1M	disinfection byproductslead	View report
NHNew Hampshire	131	836K	disinfection byproductsnitrates	View report
NJNew Jersey	361	8.9M	disinfection byproductsleadarsenic	View report
NMNew Mexico	184	1.9M	disinfection byproductsnitrates	View report
NYNew York	883	18.3M	disinfection byproductsleadnitrates	View report
NCNorth Carolina	624	9.4M	disinfection byproductslead	View report
NDNorth Dakota	128	674K	disinfection byproductslead	View report
OHOhio	698	11.7M	leadnitratesdisinfection byproducts	View report
OKOklahoma	537	3.6M	disinfection byproductsnitratesarsenic	View report
OROregon	277	3.7M	disinfection byproductslead	View report
PAPennsylvania	812	11.3M	disinfection byproductsleadnitrates	View report
RIRhode Island	38	1.1M	disinfection byproductslead	View report
SCSouth Carolina	300	4.7M	disinfection byproductslead	View report
SDSouth Dakota	152	822K	disinfection byproductsarsenic	View report
TNTennessee	403	7.8M	disinfection byproductsnitrates	View report
TXTexas	2,761	29.0M	arsenicnitratesdisinfection byproducts	View report
UTUtah	257	3.7M	nitrateslead	View report
VTVermont	120	421K	nitratesdisinfection byproducts	View report
VAVirginia	391	7.3M	disinfection byproductsnitrates	View report
WAWashington	569	9.2M	disinfection byproductslead	View report
WVWest Virginia	299	1.5M	disinfection byproductslead	View report
WIWisconsin	493	4.1M	arsenicleaddisinfection byproducts	View report
WYWyoming	95	495K	disinfection byproductslead	View report

Data source: Utility counts and violation data from EPA SDWIS. PFAS monitoring records from EPA UCMR 5. Data reflects community water systems only; private wells are not included. Full methodology →