Water Quality in 01077
Southwick, Massachusetts • Served by: Southwick Water Department, Westfield Water Department
Updated September 2026 • Data from EWG & EPA
Contaminants Detected in 01077 Water
Levels shown are the maximum detected across all water systems serving this zip code. Red values exceed EWG health guidelines.
| Contaminant | Detected Level | EWG Guideline | EPA Legal Limit |
|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) | 21.40 ppt 21400.0x | 0.00 ppt | 10 ppt |
| Haloacetic acids (HAA9)* | 55.40 ppb 923.3x | 0.06 ppb | — |
| Haloacetic acids (HAA5)* | 68.50 ppb 685.0x | 0.10 ppb | 60 ppb |
| Haloacetic acids (HAA5) | 51.90 ppb 519.0x | 0.10 ppb | 60 ppb |
| Trichloroacetic acid* | 42.20 ppb 422.0x | 0.10 ppb | — |
| Total trihalomethanes (TTHMs) | 50.70 ppb 338.0x | 0.15 ppb | 80 ppb |
| Trichloroacetic acid | 32.20 ppb 322.0x | 0.10 ppb | — |
| Haloacetic acids (HAA9) | 12.10 ppb 201.7x | 0.06 ppb | — |
| Dichloroacetic acid* | 22.10 ppb 110.5x | 0.20 ppb | — |
| Perfluorooctane sulfonate (PFOS) | 31.80 ppt 106.0x | 0.30 ppt | 4 ppt |
| Dichloroacetic acid | 17.20 ppb 86.0x | 0.20 ppb | — |
| Chloroform | 31.20 ppb 78.0x | 0.40 ppb | — |
| Perfluorooctanoic acid (PFOA) | 5.56 ppt 61.8x | 0.09 ppt | 4 ppt |
| Bromodichloromethane | 2.47 ppb 41.2x | 0.06 ppb | — |
| Chromium (hexavalent) | 0.62 ppb 30.8x | 0.02 ppb | — |
| Arsenic | 0.12 ppb 30.5x | 0.00 ppb | 10 ppb |
| Nitrate | 3.41 ppm 24.4x | 0.14 ppm | 10 ppm |
| Dibromoacetic acid | 0.17 ppb 5.8x | 0.03 ppb | — |
| Dibromochloromethane | 0.31 ppb 3.1x | 0.10 ppb | — |
| Chromium (hexavalent)* | 0.03 ppb 1.4x | 0.02 ppb | — |
| Aluminum | 6.44 ppb | 600 ppb | — |
| Barium | 91.20 ppb | 700 ppb | 2,000 ppb |
| Barium* | 6.73 ppb | 700 ppb | 2,000 ppb |
| Bromoform | 0.10 ppb | 0.50 ppb | — |
| Chlorate | 23.30 ppb | 210 ppb | — |
| Chromium (total) | 0.64 ppb | — | 100 ppb |
| Ethylene dibromide | 0.00 ppb | 0.01 ppb | 0.05 ppb |
| Fluoride | 0.01 ppm | — | 4 ppm |
| Manganese | 4.78 ppb | 100 ppb | — |
| Manganese* | 12.80 ppb | 100 ppb | — |
| Monochloroacetic acid | 2.35 ppb | 53 ppb | — |
| Monochloroacetic acid* | 4.17 ppb | 53 ppb | — |
| Perchlorate | 0.90 ppb | 1 ppb | — |
| Perfluorobutane sulfonate (PFBS) | 1.92 ppt | 2,000 ppt | — |
| Perfluoroheptanoic acid (PFHPA) | 1.63 ppt | 1,000 ppt | — |
| Perfluorohexanoic Acid (PFHxA) | 5.15 ppt | 1,000 ppt | — |
| Perfluorononanoic acid (PFNA) | 0.01 ppt | 0.01 ppt | 10 ppt |
| Strontium (Non-radioactive) | 0.10 ppb | 1,500 ppb | — |
| Strontium* | 0.01 ppb | 1,500 ppb | — |
| Vanadium | 0.64 ppb | 21 ppb | — |
| Vanadium* | 0.09 ppb | 21 ppb | — |
How to Protect Your Family
Contaminants including Arsenic, Bromodichloromethane, Chloroform are best removed with a certified reverse osmosis system. Standard pitcher filters do not reliably remove many of these contaminants.
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Shop Hydrogen FlaskFrequently Asked Questions
Is the water safe to drink in zip code 01077?
Water in 01077 (Southwick, Massachusetts) has 41 detected contaminants, of which 20 exceed EWG health guidelines. While it may meet EPA legal standards, health-focused guidelines are stricter. A certified reverse osmosis system provides the highest level of protection for your household.
What is the biggest water quality concern in 01077?
The most concerning contaminant detected in 01077 is Arsenic — 30.5x the EWG health guideline. Reverse osmosis filtration is the most effective method for removing this contaminant and protecting your family.
What filter removes contaminants from 01077 water?
A certified reverse osmosis (RO) system is the most effective solution for removing the contaminants detected in 01077. Standard pitcher filters and carbon-only filters do not reliably remove many of the contaminants found in this area.
How was the water quality data for 01077 collected?
Data is sourced from EWG's Tap Water Database, which compiles results from water utility testing reports and EPA regulatory data. Levels shown represent the maximum detected across all water systems serving zip code 01077.
More Water Quality Resources
Data sources: Environmental Working Group (EWG) Tap Water Database, U.S. EPA Safe Drinking Water Information System (SDWIS)
Last updated: September 2026
Methodology: Contaminant levels are compared against both EPA legal limits (Maximum Contaminant Levels) and EWG health guidelines, which are often stricter and based on the latest scientific research.
