Vanadium Contamination

Vanadium in Connecticut Drinking Water

Ranked by max vanadium detected (µg/L) · UCMR 3 data (2013–2015) · Data from EPA SDWIS & UCMR

Cities Tested

Over HA

% Over HA

3.45 µg/L

State Avg

▼ 1% vs national

vs National

105

Health Violations

Analysis

Vanadium in Connecticut: what the data shows

Connecticut has 84 cities with vanadium data from the EPA's UCMR 3 program (2013–2015). Vanadium was detected above the 21 µg/L EPA short-term health advisory in 3 of those cities. The state average max detected level is 3.45 µg/L. Vanadium occurs naturally in groundwater, particularly in the western United States where it leaches from volcanic rock and oil shale formations. Industrial sources include steel manufacturing, oil refining, and fossil fuel combustion. There is no federal MCL for vanadium — the EPA established a short-term health advisory of 21 µg/L for a 10 kg child consuming 1 L/day for 10 days. Long-term exposure to elevated vanadium has been associated with kidney effects in animal studies and possible developmental impacts. Reverse osmosis and ion exchange systems are effective at removing vanadium from drinking water.

Comparison

Cities exceeding 21 µg/L EPA short-term HA (no MCL)

Connecticut

3 of 84 cities

← ▼ 1% below national rate (better)

National avg

179 of 3261 cities

City Map

Vanadium data across Connecticut

Each dot is a city with UCMR 3 vanadium testing data. Cities where vanadium exceeds the 21 µg/L EPA short-term health advisory are highlighted. Size reflects population served.

Worst Offenders

Top 10 cities by vanadium level in Connecticut

Highest Vanadium levels (µg/L)

All Cities

All Connecticut cities ranked by vanadium level

#	City	Level	Over HA?	Violations	Grade
1	East Windsor	30.80 µg/L	Over HA	25	F
2	Enfield	30.80 µg/L	Over HA	9	D
3	Somers	30.80 µg/L	Over HA	6	C+
4	Farmington	21.00 µg/L	No	3	D+
5	Avon	21.00 µg/L	No	3	C+
6	Granby	9.70 µg/L	No	3	C+
7	South Windsor	7.30 µg/L	No	5	C
8	Windsor Locks	7.30 µg/L	No	0	B-
9	Ellington	7.30 µg/L	No	0	B
10	Suffield	7.30 µg/L	No	1	C+
11	Manchester	7.30 µg/L	No	8	C
12	Mansfield	7.30 µg/L	No	85	F
13	Tolland	7.30 µg/L	No	24	F
14	Stafford	7.30 µg/L	No	12	C
15	Cheshire	5.90 µg/L	No	28	F
16	Southington	5.90 µg/L	No	12	F
17	Wolcott	5.90 µg/L	No	18	F
18	North Haven	3.50 µg/L	No	0	C-
19	Wallingford	3.50 µg/L	No	4	D
20	Stamford	3.00 µg/L	No	4	F
21	Greenwich	3.00 µg/L	No	5	F
22	Plainville	2.40 µg/L	No	4	C
23	Bristol	2.40 µg/L	No	4	C+
24	Glastonbury	2.20 µg/L	No	4	B+
25	Cromwell	1.90 µg/L	No	1	B
26	Berlin	1.90 µg/L	No	6	F
27	Ansonia	1.50 µg/L	No	0	B+
28	Bethany	1.50 µg/L	No	4	C-
29	Branford	1.50 µg/L	No	0	A-
30	Derby	1.50 µg/L	No	0	B+
31	East Haven	1.50 µg/L	No	0	A-
32	Hamden	1.50 µg/L	No	0	A-
33	Milford	1.50 µg/L	No	0	B+
34	New Haven	1.50 µg/L	No	0	A-
35	North Branford	1.50 µg/L	No	25	F
36	Orange	1.50 µg/L	No	0	B+
37	Prospect	1.50 µg/L	No	1	C+
38	Seymour	1.50 µg/L	No	2	D+
39	West Haven	1.50 µg/L	No	0	B+
40	Woodbridge	1.50 µg/L	No	0	B+
41	Meriden	1.50 µg/L	No	4	C+
42	Plymouth	1.10 µg/L	No	18	C
43	Deep River	0.81 µg/L	No	5	C
44	Beacon Falls	0.77 µg/L	No	3	C-
45	Oxford	0.77 µg/L	No	6	B
46	Danbury	0.75 µg/L	No	59	F
47	Bethel	0.75 µg/L	No	25	F
48	Brookfield	0.75 µg/L	No	135	F
49	Groton	0.74 µg/L	No	17	F
50	Stonington	0.74 µg/L	No	6	B
51	Ledyard	0.74 µg/L	No	23	D+
52	Darien	0.71 µg/L	No	7	F
53	New Canaan	0.71 µg/L	No	7	F
54	Norwalk	0.71 µg/L	No	7	D
55	Wilton	0.63 µg/L	No	7	D
56	Middletown	0.57 µg/L	No	11	D
57	Clinton	0.56 µg/L	No	4	D+
58	Guilford	0.56 µg/L	No	20	D
59	Madison	0.56 µg/L	No	18	C+
60	Old Saybrook	0.56 µg/L	No	0	B-
61	Westbrook	0.56 µg/L	No	7	C+
62	Waterbury	0.47 µg/L	No	14	C
63	Naugatuck	0.47 µg/L	No	1	A
64	Bridgeport	0.46 µg/L	No	2	C-
65	Fairfield	0.46 µg/L	No	2	C-
66	Redding	0.46 µg/L	No	2	C-
67	Shelton	0.46 µg/L	No	2	C-
68	Stratford	0.46 µg/L	No	2	C-
69	Westport	0.46 µg/L	No	2	C-
70	Newtown	0.46 µg/L	No	46	F
71	Harwinton	0.40 µg/L	No	5	D
72	Torrington	0.40 µg/L	No	3	B+
73	East Hartford	0.39 µg/L	No	0	A-
74	Hartford	0.39 µg/L	No	0	A-
75	Newington	0.39 µg/L	No	1	D
76	Rocky Hill	0.39 µg/L	No	1	B
77	West Hartford	0.39 µg/L	No	0	B+
78	Wethersfield	0.39 µg/L	No	0	A-
79	Windsor	0.39 µg/L	No	0	A-
80	Portland	0.39 µg/L	No	9	C
81	Watertown	0.26 µg/L	No	11	D+
82	New Britain	0.23 µg/L	No	0	B-
83	Hampton	0.22 µg/L	No	1	B
84	Mashantucket	0.20 µg/L	No	7	B

FAQ

Frequently asked questions about vanadium in Connecticut

Is vanadium in Connecticut tap water harmful?

Vanadium has no federal MCL. The EPA short-term health advisory is 21 µg/L. 3 cities in Connecticut exceed this level. Long-term exposure has been linked to kidney effects in animal studies. Vanadium is most common in groundwater in the western US.

How can I remove vanadium from my drinking water?

Reverse osmosis (RO) systems are highly effective at removing vanadium, typically reducing it by 90% or more. Ion exchange systems also work. Standard activated carbon filters are not effective against vanadium. If your water comes from a private well in the western US, consider testing for vanadium.

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