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

217

Cities Tested

Exceeds Limit

% Exceeds Limit

17.0 µg/L

State Avg

▼ 1% vs national

vs National

594

Health Violations

Analysis

HAA5 in New York: what the data shows

New York has 217 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 217 cities

← ▼ 1% below national rate (better)

National avg

23 of 4342 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 (C)	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	Rye Brook (V)	36.5 µg/L	No	0	A
21	Rye (T)	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	Cohoes (C)	29.7 µg/L	No	5	B+
33	Colonie (V)	29.6 µg/L	No	1	A-
34	Farmington (T)	29.1 µg/L	No	7	A
35	Newburgh (T)	28.6 µg/L	No	50	F
36	Amsterdam (C)	27.3 µg/L	No	33	B-
37	Clarkstown (T)	26.8 µg/L	No	11	B-
38	Clifton Park (T)	26.6 µg/L	No	4	D
39	Olean (C)	26.5 µg/L	No	1	B
40	Halfmoon (T)	26.4 µg/L	No	3	A
41	Nyack (V)	26.3 µg/L	No	3	B
42	South Nyack (V)	26.3 µg/L	No	3	B
43	Canandaigua (C)	26.2 µg/L	No	2	A-
44	Fleming (T)	26.1 µg/L	No	12	A
45	Springport (T)	26.1 µg/L	No	8	A-
46	Poughkeepsie (T)	26.0 µg/L	No	0	A-
47	Peekskill (C)	24.7 µg/L	No	15	A-
48	Ardsley (V)	24.3 µg/L	No	4	B-
49	Bronxville (V)	24.3 µg/L	No	4	B-
50	Dobbs Ferry (V)	24.3 µg/L	No	4	B-
51	Eastchester (T)	24.3 µg/L	No	4	B-
52	Hastings-On-Hudson (V)	24.3 µg/L	No	4	B-
53	New Rochelle (C)	24.3 µg/L	No	4	B-
54	Pelham Manor (V)	24.3 µg/L	No	4	B-
55	Pelham (V)	24.3 µg/L	No	4	B-
56	Tuckahoe (V)	24.3 µg/L	No	4	B-
57	Auburn (C)	23.3 µg/L	No	0	A+
58	Ithaca (C)	23.3 µg/L	No	11	B+
59	North Tonawanda (C)	23.2 µg/L	No	0	A+
60	Oneida (C)	23.1 µg/L	No	3	A
61	Oneida Castle (V)	23.1 µg/L	No	3	A
62	Middletown (C)	22.6 µg/L	No	3	A
63	Cortlandt (T)	22.6 µg/L	No	11	B+
64	Poughkeepsie (C)	22.5 µg/L	No	2	A
65	Gloversville (C)	22.4 µg/L	No	2	A-
66	Clifton Springs (V)	21.8 µg/L	No	0	B+
67	Lewiston (V)	20.0 µg/L	No	0	A-
68	Saratoga Sprngs (C)	19.8 µg/L	No	3	A-
69	Syracuse (C)	19.8 µg/L	No	29	C+
70	Albany (C)	19.5 µg/L	No	0	A-
71	Rochester (C)	19.4 µg/L	No	3	B
72	Amherst (T)	19.4 µg/L	No	0	A
73	Cheektowaga (T)	19.4 µg/L	No	0	A
74	Clarence (T)	19.4 µg/L	No	0	A
75	Concord (T)	19.4 µg/L	No	8	B-
76	Depew (V)	19.4 µg/L	No	0	A
77	Evans (T)	19.4 µg/L	No	0	A
78	Lackawanna (C)	19.4 µg/L	No	0	A
79	Lancaster (V)	19.4 µg/L	No	0	A
80	Sloan (V)	19.4 µg/L	No	0	A
81	Lockport (C)	19.3 µg/L	No	0	A
82	Lockport (T)	18.8 µg/L	No	0	A+
83	Watkins Glen (V)	18.7 µg/L	No	7	A
84	Elma (T)	18.6 µg/L	No	0	A+
85	Buchanan (V)	18.6 µg/L	No	0	A
86	Tonawanda (C)	18.3 µg/L	No	0	A
87	Queensbury (T)	17.6 µg/L	No	2	F
88	Macedon (T)	17.5 µg/L	No	3	A+
89	Buffalo (C)	17.0 µg/L	No	2	A-
90	Oswego (C)	16.9 µg/L	No	4	A
91	New Windsor (T)	16.3 µg/L	No	14	D+
92	Geneva (C)	16.2 µg/L	No	2	A
93	Geneseo (V)	16.1 µg/L	No	7	A-
94	Deerfield (T)	16.1 µg/L	No	25	B-
95	Marcy (T)	16.1 µg/L	No	25	B+
96	New Hartford (T)	16.1 µg/L	No	25	B+
97	New Hartford (V)	16.1 µg/L	No	25	B+
98	New York Mills (V)	16.1 µg/L	No	25	B+
99	Oriskany (V)	16.1 µg/L	No	25	B+
100	Utica (C)	16.1 µg/L	No	25	B+
101	Whitesboro (V)	16.1 µg/L	No	25	B+
102	Whitestown (T)	16.1 µg/L	No	25	B+
103	Yorkville (V)	16.1 µg/L	No	25	B+
104	Westmoreland (T)	16.1 µg/L	No	27	B-
105	Beacon (C)	15.5 µg/L	No	4	A-
106	Elmira (C)	15.3 µg/L	No	5	B+
107	Elmira Heights (V)	15.3 µg/L	No	5	B+
108	Elmira (T)	15.3 µg/L	No	5	B+
109	Southport (T)	15.3 µg/L	No	5	B+
110	Kenmore (V)	14.9 µg/L	No	0	A
111	Vestal (T)	14.8 µg/L	No	2	A-
112	Evans Mills (V)	14.5 µg/L	No	1	A
113	Brighton (T)	14.2 µg/L	No	5	C+
114	Chili (T)	14.2 µg/L	No	1	B
115	Churchville (V)	14.2 µg/L	No	1	B
116	Clarkson (T)	14.2 µg/L	No	1	B
117	East Rochester (X)	14.2 µg/L	No	1	B
118	Fairport (V)	14.2 µg/L	No	1	B
119	Gates (T)	14.2 µg/L	No	1	B
120	Greece (T)	14.2 µg/L	No	1	B
121	Hamlin (T)	14.2 µg/L	No	1	B
122	Henrietta (T)	14.2 µg/L	No	1	B
123	Honeoye Falls (V)	14.2 µg/L	No	1	B
124	Kendall (T)	14.2 µg/L	No	1	B
125	Mendon (T)	14.2 µg/L	No	1	B
126	Ogden (T)	14.2 µg/L	No	1	B
127	Parma (T)	14.2 µg/L	No	1	B
128	Penfield (T)	14.2 µg/L	No	1	B
129	Perinton (T)	14.2 µg/L	No	1	B
130	Pittsford (T)	14.2 µg/L	No	1	B
131	Pittsford (V)	14.2 µg/L	No	1	B
132	Riga (T)	14.2 µg/L	No	1	B
133	Rush (T)	14.2 µg/L	No	2	B
134	Scottsville (V)	14.2 µg/L	No	1	B
135	Spencerport (V)	14.2 µg/L	No	1	B
136	Sweden (T)	14.2 µg/L	No	1	B
137	Victor (T)	14.2 µg/L	No	3	B
138	Webster (T)	14.2 µg/L	No	1	B
139	Wheatland (T)	14.2 µg/L	No	1	B
140	Batavia (T)	14.2 µg/L	No	2	B+
141	Victor (V)	14.2 µg/L	No	3	B
142	Oakfield (T)	14.2 µg/L	No	4	B+
143	Oakfield (V)	14.2 µg/L	No	4	B+
144	Clay (T)	13.9 µg/L	No	2	A+
145	Palmyra (V)	13.8 µg/L	No	2	A-
146	Kingston (C)	13.8 µg/L	No	8	A-
147	Irondequoit (T)	13.6 µg/L	No	1	C+
148	Niagara Falls (C)	13.4 µg/L	No	0	A+
149	Binghamton (C)	13.0 µg/L	No	5	A-
150	Batavia (C)	12.5 µg/L	No	0	A+
151	Ogdensburg (C)	12.4 µg/L	No	1	A-
152	De Witt (T)	12.3 µg/L	No	6	A-
153	Brockport (V)	11.3 µg/L	No	0	A-
154	Grand Island (T)	10.8 µg/L	No	2	C+
155	Rotterdam (T)	7.9 µg/L	No	2	A
156	Canton (V)	7.4 µg/L	No	0	A+
157	Schenectady (C)	7.3 µg/L	No	1	B+
158	Herkimer (V)	7.3 µg/L	No	44	F
159	Wappinger (T)	7.1 µg/L	No	9	D
160	Dunkirk (C)	7.0 µg/L	No	1	C
161	Cassadaga (V)	6.5 µg/L	No	1	A-
162	New Castle (T)	5.8 µg/L	No	3	B
163	Ontario (T)	5.7 µg/L	No	4	A+
164	Woodbury (T)	5.7 µg/L	No	18	C+
165	Horseheads (V)	5.4 µg/L	No	6	D+
166	Freeport (V)	5.3 µg/L	No	2	A+
167	Endicott (V)	5.3 µg/L	No	0	A-
168	Johnson City (V)	5.3 µg/L	No	2	A-
169	Morrisville (V)	5.0 µg/L	No	0	A-
170	Deruyter (V)	4.8 µg/L	No	0	A-
171	Cortland (C)	4.7 µg/L	No	5	A
172	Corning (C)	4.1 µg/L	No	2	B-
173	Shawangunk (T)	3.9 µg/L	No	7	B-
174	Ramapo (T)	2.3 µg/L	No	19	C+
175	Kiryas Joel (V)	2.3 µg/L	No	3	D+
176	Fulton (C)	2.2 µg/L	No	2	A
177	Cattaraugus (V)	2.1 µg/L	No	14	A-
178	Glenville (T)	1.9 µg/L	No	0	A
179	Glen Cove (C)	1.7 µg/L	No	4	B+
180	Cairo (T)	1.7 µg/L	No	45	F
181	Corinth (V)	1.7 µg/L	No	3	B+
182	Brookhaven (T)	1.6 µg/L	No	3	C
183	Jamestown (C)	1.6 µg/L	No	1	A
184	Rockville Center (V)	1.6 µg/L	No	5	A
185	Newburgh (C)	1.4 µg/L	No	17	A-
186	Lynbrook (V)	1.1 µg/L	No	3	B
187	North Hempstead (T)	1.0 µg/L	No	9	F
188	Hempstead (T)	1.0 µg/L	No	14	D
189	Stewart Manor (V)	1.0 µg/L	No	5	A-
190	Riverhead (T)	0.9 µg/L	No	5	C+
191	New Hyde Park (V)	0.9 µg/L	No	1	A
192	East Hampton (T)	0.8 µg/L	No	3	A-
193	Islip (T)	0.8 µg/L	No	7	B-
194	Southold (T)	0.8 µg/L	No	11	B-
195	Babylon (T)	0.8 µg/L	No	6	B+
196	Southampton (T)	0.8 µg/L	No	5	B
197	Oyster Bay (T)	0.8 µg/L	No	14	B-
198	Smithtown (T)	0.7 µg/L	No	5	B+
199	Great Neck Estates (V)	0.7 µg/L	No	2	A+
200	Great Neck Plaza (V)	0.7 µg/L	No	2	A+
201	Great Neck (V)	0.7 µg/L	No	2	A+
202	Kensington (V)	0.7 µg/L	No	2	A+
203	Kings Point (V)	0.7 µg/L	No	2	A+
204	Saddle Rock (V)	0.7 µg/L	No	2	A+
205	Thomaston (V)	0.7 µg/L	No	2	A+
206	Huntington (T)	0.7 µg/L	No	11	D
207	Long Beach (C)	0.6 µg/L	No	3	A
208	Garden City (V)	0.6 µg/L	No	5	A-
209	Roslyn (V)	0.6 µg/L	No	1	A
210	Dannemora (V)	0.5 µg/L	No	6	A-
211	Westbury (V)	0.5 µg/L	No	2	A-
212	Hempstead (V)	0.4 µg/L	No	1	A-
213	Mineola (V)	0.4 µg/L	No	1	A-
214	Massapequa Park (V)	0.2 µg/L	No	0	A
215	Owego (V)	0.2 µg/L	No	5	B-
216	Sea Cliff (V)	0.1 µg/L	No	0	A+
217	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.

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