HAA5 Contamination

HAA5 in New York Drinking Water

Ranked by average HAA5 concentration (µg/L) · UCMR 4 data (2018–2020) · Data from EPA SDWIS & UCMR

219

Cities Tested

Exceeds Limit

% Exceeds Limit

17.0 µg/L

State Avg

▼ 1% vs national

vs National

630

Health Violations

Analysis

HAA5 in New York: what the data shows

New York has 219 cities with HAA5 monitoring data from the EPA's UCMR 4 program (2018–2020). Haloacetic acids (HAA5) form when chlorine-based disinfectants react with natural organic matter in water. The state average is 17.0 µg/L — better than the 15.5 µg/L national average. No cities currently exceed the 60 µg/L EPA MCL. HAA5 is a group of five chlorinated and brominated acetic acids. Long-term exposure above the MCL is associated with increased cancer risk and adverse reproductive outcomes. The EPA classifies total HAA5 as a probable human carcinogen at elevated concentrations. Activated carbon filtration (especially granular or block carbon) is effective at reducing HAA5. Running water through a refrigerator filter or letting it sit in an open pitcher for 30 minutes also helps, as some HAA5 species are volatile. Boiling does not remove disinfection byproducts and may concentrate them.

Comparison

Cities exceeding 60 µg/L EPA MCL

New York

0 of 219 cities

← ▼ 1% below national rate (better)

National avg

23 of 4420 cities

City Map

HAA5 data across New York

Each dot is a city with UCMR 4 HAA5 testing data. Cities where average HAA5 exceeded the 60 µg/L EPA MCL are highlighted. Size reflects population served.

Worst Offenders

Top 10 cities by haa5 level in New York

Highest HAA5 levels (µg/L)

All Cities

All New York cities ranked by haa5 level

#	City	Level	Exceeds?	Violations	Grade
1	Wallkill (T)	56.2 µg/L	No	23	F
2	White Plains (C)	53.2 µg/L	No	1	A-
3	Mamaroneck	52.4 µg/L	No	5	B+
4	Fredonia (V)	52.1 µg/L	No	0	D
5	Oneonta (T)	50.2 µg/L	No	1	C
6	Oneonta (T)	50.2 µg/L	No	0	A-
7	New York (C)	49.3 µg/L	No	11	A-
8	Guilderland (T)	48.7 µg/L	No	18	A-
9	Tarrytown (V)	47.9 µg/L	No	3	B+
10	Plattsburgh (C)	46.4 µg/L	No	1	A-
11	Greenburgh (T)	44.3 µg/L	No	40	B
12	Bethlehem (T)	43.1 µg/L	No	12	A-
13	Watertown (C)	42.0 µg/L	No	19	B
14	Massena (V)	41.1 µg/L	No	2	A-
15	Mount Vernon (C)	40.5 µg/L	No	2	A-
16	Glens Falls (C)	39.5 µg/L	No	17	B+
17	Mount Pleasant (T)	38.8 µg/L	No	36	C
18	Yonkers (C)	37.1 µg/L	No	2	B+
19	Port Chester (V)	36.5 µg/L	No	0	A
20	Port Chester (V)	36.5 µg/L	No	0	A
21	Port Chester (V)	36.5 µg/L	No	0	A
22	Ticonderoga (T)	35.5 µg/L	No	4	A-
23	Watertown (T)	35.5 µg/L	No	20	B
24	Rome (C)	34.3 µg/L	No	20	B+
25	Wheatfield (T)	32.6 µg/L	No	0	A+
26	Yorktown (T)	32.2 µg/L	No	13	B
27	Ossining (T)	30.7 µg/L	No	6	C
28	Leray (T)	30.2 µg/L	No	4	B+
29	Scarsdale	30.1 µg/L	No	0	A
30	Rensselaer (C)	29.9 µg/L	No	6	B+
31	Colonie (T)	29.8 µg/L	No	1	A+
32	Troy (C)	29.7 µg/L	No	4	B-
33	Cohoes (C)	29.7 µg/L	No	5	B+
34	Colonie (V)	29.6 µg/L	No	1	A-
35	Farmington (T)	29.1 µg/L	No	7	A
36	Newburgh (T)	28.6 µg/L	No	50	F
37	Amsterdam (C)	27.3 µg/L	No	33	B-
38	Clarkstown (T)	26.8 µg/L	No	11	B-
39	Clifton Park (T)	26.6 µg/L	No	4	D
40	Olean (C)	26.5 µg/L	No	1	B
41	Halfmoon (T)	26.4 µg/L	No	3	A
42	Nyack (V)	26.3 µg/L	No	3	B
43	Nyack (V)	26.3 µg/L	No	3	B
44	Canandaigua (C)	26.2 µg/L	No	2	A-
45	Fleming (T)	26.1 µg/L	No	12	A
46	Springport (T)	26.1 µg/L	No	8	A-
47	Poughkeepsie (T)	26.0 µg/L	No	0	A-
48	Peekskill (C)	24.7 µg/L	No	15	A-
49	Tuckahoe (V)	24.3 µg/L	No	4	B-
50	Tuckahoe (V)	24.3 µg/L	No	4	B-
51	Tuckahoe (V)	24.3 µg/L	No	4	B-
52	Tuckahoe (V)	24.3 µg/L	No	4	B-
53	Tuckahoe (V)	24.3 µg/L	No	4	B-
54	Tuckahoe (V)	24.3 µg/L	No	4	B-
55	Tuckahoe (V)	24.3 µg/L	No	4	B-
56	Tuckahoe (V)	24.3 µg/L	No	4	B-
57	Tuckahoe (V)	24.3 µg/L	No	4	B-
58	Auburn (C)	23.3 µg/L	No	0	A+
59	Ithaca (C)	23.3 µg/L	No	11	B+
60	North Tonawanda (C)	23.2 µg/L	No	0	A+
61	Oneida (C)	23.1 µg/L	No	3	A
62	Oneida (C)	23.1 µg/L	No	3	A
63	Middletown (C)	22.6 µg/L	No	3	A
64	Cortlandt (T)	22.6 µg/L	No	11	B+
65	Poughkeepsie (C)	22.5 µg/L	No	2	A
66	Gloversville (C)	22.4 µg/L	No	2	A-
67	Clifton Springs (V)	21.8 µg/L	No	0	B+
68	Lewiston (V)	20.0 µg/L	No	0	A-
69	Saratoga Sprngs (C)	19.8 µg/L	No	3	A-
70	Syracuse (C)	19.8 µg/L	No	29	C+
71	Albany (C)	19.5 µg/L	No	0	A-
72	Wheatland (T)	19.4 µg/L	No	3	B
73	Evans (T)	19.4 µg/L	No	0	A
74	Evans (T)	19.4 µg/L	No	8	B-
75	Evans (T)	19.4 µg/L	No	0	A
76	Evans (T)	19.4 µg/L	No	0	A
77	Evans (T)	19.4 µg/L	No	0	A
78	Evans (T)	19.4 µg/L	No	0	A
79	Evans (T)	19.4 µg/L	No	0	A
80	Evans (T)	19.4 µg/L	No	0	A
81	Evans (T)	19.4 µg/L	No	0	A
82	Bedford (T)	19.3 µg/L	No	9	D
83	Lockport (C)	19.3 µg/L	No	0	A
84	Lockport (T)	18.8 µg/L	No	0	A+
85	Watkins Glen (V)	18.7 µg/L	No	7	A
86	Elma (T)	18.6 µg/L	No	0	A+
87	Buchanan (V)	18.6 µg/L	No	0	A
88	Evans (T)	18.3 µg/L	No	0	A
89	Queensbury (T)	17.6 µg/L	No	2	F
90	Macedon (T)	17.5 µg/L	No	3	A+
91	Evans (T)	17.0 µg/L	No	2	A-
92	Oswego (C)	16.9 µg/L	No	4	A
93	New Windsor (T)	16.3 µg/L	No	14	D+
94	Geneva (C)	16.2 µg/L	No	2	A
95	Geneseo (V)	16.1 µg/L	No	7	A-
96	New Hartford (V)	16.1 µg/L	No	27	B-
97	New Hartford (V)	16.1 µg/L	No	25	B-
98	New Hartford (V)	16.1 µg/L	No	25	B+
99	New Hartford (V)	16.1 µg/L	No	25	B+
100	New Hartford (V)	16.1 µg/L	No	25	B+
101	New Hartford (V)	16.1 µg/L	No	25	B+
102	New Hartford (V)	16.1 µg/L	No	25	B+
103	New Hartford (V)	16.1 µg/L	No	25	B+
104	New Hartford (V)	16.1 µg/L	No	25	B+
105	New Hartford (V)	16.1 µg/L	No	25	B+
106	New Hartford (V)	16.1 µg/L	No	25	B+
107	Beacon (C)	15.5 µg/L	No	4	A-
108	Elmira Heights (V)	15.3 µg/L	No	5	B+
109	Elmira Heights (V)	15.3 µg/L	No	5	B+
110	Elmira Heights (V)	15.3 µg/L	No	5	B+
111	Elmira Heights (V)	15.3 µg/L	No	5	B+
112	Kenmore (V)	14.9 µg/L	No	0	A
113	Vestal (T)	14.8 µg/L	No	2	A-
114	Evans Mills (V)	14.5 µg/L	No	1	A
115	Wheatland (T)	14.2 µg/L	No	2	B+
116	Wheatland (T)	14.2 µg/L	No	3	B
117	Wheatland (T)	14.2 µg/L	No	1	B
118	Wheatland (T)	14.2 µg/L	No	4	B+
119	Wheatland (T)	14.2 µg/L	No	3	B
120	Wheatland (T)	14.2 µg/L	No	4	B+
121	Wheatland (T)	14.2 µg/L	No	5	C+
122	Wheatland (T)	14.2 µg/L	No	2	B
123	Wheatland (T)	14.2 µg/L	No	1	B
124	Wheatland (T)	14.2 µg/L	No	1	B
125	Wheatland (T)	14.2 µg/L	No	1	B
126	Wheatland (T)	14.2 µg/L	No	1	B
127	Wheatland (T)	14.2 µg/L	No	1	B
128	Wheatland (T)	14.2 µg/L	No	1	B
129	Wheatland (T)	14.2 µg/L	No	1	B
130	Wheatland (T)	14.2 µg/L	No	1	B
131	Wheatland (T)	14.2 µg/L	No	1	B
132	Wheatland (T)	14.2 µg/L	No	1	B
133	Wheatland (T)	14.2 µg/L	No	1	B
134	Wheatland (T)	14.2 µg/L	No	1	B
135	Wheatland (T)	14.2 µg/L	No	1	B
136	Wheatland (T)	14.2 µg/L	No	1	B
137	Wheatland (T)	14.2 µg/L	No	1	B
138	Wheatland (T)	14.2 µg/L	No	1	B
139	Wheatland (T)	14.2 µg/L	No	1	B
140	Wheatland (T)	14.2 µg/L	No	1	B
141	Wheatland (T)	14.2 µg/L	No	1	B
142	Wheatland (T)	14.2 µg/L	No	1	B
143	Wheatland (T)	14.2 µg/L	No	1	B
144	Wheatland (T)	14.2 µg/L	No	1	B
145	Wheatland (T)	14.2 µg/L	No	1	B
146	Clay (T)	13.9 µg/L	No	2	A+
147	Palmyra (V)	13.8 µg/L	No	2	A-
148	Kingston (C)	13.8 µg/L	No	8	A-
149	Wheatland (T)	13.6 µg/L	No	1	C+
150	Niagara Falls (C)	13.4 µg/L	No	0	A+
151	Binghamton (C)	13.0 µg/L	No	5	A-
152	Batavia (C)	12.5 µg/L	No	0	A+
153	Ogdensburg (C)	12.4 µg/L	No	1	A-
154	De Witt (T)	12.3 µg/L	No	6	A-
155	Brockport (V)	11.3 µg/L	No	0	A-
156	Grand Island (T)	10.8 µg/L	No	2	C+
157	Rotterdam (T)	7.9 µg/L	No	2	A
158	Canton (V)	7.4 µg/L	No	0	A+
159	Schenectady (C)	7.3 µg/L	No	1	B+
160	Herkimer (V)	7.3 µg/L	No	44	F
161	Wappinger (T)	7.1 µg/L	No	9	D
162	Dunkirk (C)	7.0 µg/L	No	1	C
163	Cassadaga (V)	6.5 µg/L	No	1	A-
164	New Castle (T)	5.8 µg/L	No	3	B
165	Ontario (T)	5.7 µg/L	No	4	A+
166	Woodbury (T)	5.7 µg/L	No	18	C+
167	Horseheads (V)	5.4 µg/L	No	6	D+
168	Freeport (V)	5.3 µg/L	No	2	A+
169	Endicott (V)	5.3 µg/L	No	0	A-
170	Johnson City (V)	5.3 µg/L	No	2	A-
171	Morrisville (V)	5.0 µg/L	No	0	A-
172	Deruyter (V)	4.8 µg/L	No	0	A-
173	Cortland (C)	4.7 µg/L	No	5	A
174	Corning (C)	4.1 µg/L	No	2	B-
175	Shawangunk (T)	3.9 µg/L	No	7	B-
176	Ramapo (T)	2.3 µg/L	No	19	C+
177	Kiryas Joel (V)	2.3 µg/L	No	3	D+
178	Fulton (C)	2.2 µg/L	No	2	A
179	Cattaraugus (V)	2.1 µg/L	No	14	A-
180	Glenville (T)	1.9 µg/L	No	0	A
181	Glen Cove (C)	1.7 µg/L	No	4	B+
182	Cairo (T)	1.7 µg/L	No	45	F
183	Corinth (V)	1.7 µg/L	No	3	B+
184	Smithtown (T)	1.6 µg/L	No	3	C
185	Jamestown (C)	1.6 µg/L	No	1	A
186	Rockville Center (V)	1.6 µg/L	No	5	A
187	Newburgh (C)	1.4 µg/L	No	17	A-
188	Hempstead (T)	1.1 µg/L	No	3	B
189	Hempstead (T)	1.0 µg/L	No	9	F
190	Hempstead (T)	1.0 µg/L	No	14	D
191	Hempstead (T)	1.0 µg/L	No	5	A-
192	Smithtown (T)	0.9 µg/L	No	5	C+
193	New Hyde Park (V)	0.9 µg/L	No	1	A
194	Smithtown (T)	0.8 µg/L	No	6	B+
195	Smithtown (T)	0.8 µg/L	No	7	B-
196	Smithtown (T)	0.8 µg/L	No	11	B-
197	Smithtown (T)	0.8 µg/L	No	3	A-
198	Smithtown (T)	0.8 µg/L	No	5	B
199	Oyster Bay (T)	0.8 µg/L	No	14	B-
200	Smithtown (T)	0.7 µg/L	No	5	B+
201	Great Neck Estates (V)	0.7 µg/L	No	2	A+
202	Great Neck Estates (V)	0.7 µg/L	No	2	A+
203	Great Neck Estates (V)	0.7 µg/L	No	2	A+
204	Great Neck Estates (V)	0.7 µg/L	No	2	A+
205	Great Neck Estates (V)	0.7 µg/L	No	2	A+
206	Great Neck Estates (V)	0.7 µg/L	No	2	A+
207	Great Neck Estates (V)	0.7 µg/L	No	2	A+
208	Smithtown (T)	0.7 µg/L	No	11	D
209	Long Beach (C)	0.6 µg/L	No	3	A
210	Garden City (V)	0.6 µg/L	No	5	A-
211	Roslyn (V)	0.6 µg/L	No	1	A
212	Dannemora (V)	0.5 µg/L	No	6	A-
213	Westbury (V)	0.5 µg/L	No	2	A-
214	Hempstead (V)	0.4 µg/L	No	1	A-
215	Mineola (V)	0.4 µg/L	No	1	A-
216	Oyster Bay (T)	0.2 µg/L	No	0	A
217	Owego (V)	0.2 µg/L	No	5	B-
218	Sea Cliff (V)	0.1 µg/L	No	0	A+
219	Malone (V)	0.1 µg/L	No	2	A+

FAQ

Frequently asked questions about haa5 in New York

What is HAA5 and why does it appear in New York tap water?

HAA5 (haloacetic acids) are disinfection byproducts that form when chlorine reacts with naturally occurring organic matter in source water. They are a normal byproduct of the disinfection process that makes water safe to drink. No cities in New York currently exceed the 60 µg/L EPA MCL. The state average is 17.0 µg/L.

How can I reduce HAA5 exposure from New York drinking water?

Activated carbon filters (granular or block) effectively reduce HAA5. Refrigerator filters and under-sink carbon systems are convenient options. Unlike lead or PFAS, HAA5 levels can also be reduced by letting water stand in an open container, as some species evaporate. Boiling does NOT remove HAA5 and can concentrate them by reducing water volume.

Which New York cities have the highest HAA5 levels?

The cities with the highest average HAA5 concentrations in New York are: Wallkill (T) (56.2 µg/L), White Plains (C) (53.2 µg/L), Mamaroneck (52.4 µg/L), Fredonia (V) (52.1 µg/L), Oneonta (T) (50.2 µg/L). Note: this data is from UCMR 4 testing (2018–2020) and may not reflect current levels.

More contaminants