Arsenic in Drinking Water — City of Rio Vista, CA
City of Rio Vista · Birds Landing, CA · 10,489 people served
Data: EPA SDWIS, ECHO, 2016 Consumer Confidence Report
Arsenic Detected in CITY OF RIO VISTA
Arsenic was detected at 9 ppb in the CITY OF RIO VISTA water system serving Birds Landing, Clarksburg, Rio Vista, Walnut Grove (CA), approaching the EPA limit of 10 ppb.
This system serves approximately 10,489 people across 4 ZIP codes.
Data source: 2016 Consumer Confidence Report (CCR) and EPA SDWIS/ECHO.
Detected Levels
| Contaminant | Level Detected | EPA Limit | Status |
|---|---|---|---|
| Arsenic | 9 ppb | 10 ppb | Within Limit |
Health Effects of Arsenic
The EPA classifies arsenic as a Group A human carcinogen. Long-term exposure to arsenic in drinking water — even at levels below the MCL — increases the risk of bladder, lung, skin, kidney, and liver cancer. Non-cancer effects include cardiovascular disease, diabetes, skin lesions (darkening and thickening), peripheral neuropathy, and immune system suppression. Children exposed to arsenic may experience cognitive development problems.
Source: ATSDR — Arsenic Toxicological Profile; EPA.
EPA Standard
The EPA maximum contaminant level (MCL) for arsenic is 10 ppb, governed by the Arsenic Rule (2006). Water systems that exceed this limit must notify consumers and take corrective action.
What You Can Do
- Install a reverse osmosis system — the most reliable arsenic removal technology for homes
- Use a point-of-use filter certified to NSF 53 for arsenic reduction
- Have your water tested by an EPA-certified lab — especially if you use a private well
- If arsenic is naturally occurring in your area, consider whole-house treatment
- Do not rely on standard carbon filters — most do not remove arsenic
- If on a private well, test annually; arsenic levels can fluctuate seasonally
Recommended Water Filters
The most effective treatment for arsenic removal is Reverse Osmosis.
| Filter Type | Effectiveness | NSF Standard | Notes |
|---|---|---|---|
| Reverse Osmosis (RO) | 95-99% | NSF 58 | Most effective for both arsenate (As V) and arsenite (As III) |
| Adsorptive Media (iron-based) | 90-95% | NSF 53 | Effective for arsenate; may need pre-oxidation for arsenite |
| Distillation | 98%+ | NSF 62 | Very effective but impractical for large volumes |
ZIP Codes Served by This System
Check water quality for your specific ZIP code:
Related Resources
Detected Levels
| Contaminant | Level Detected | EPA Limit | Status |
|---|---|---|---|
| Arsenic | 9 ppb | 10 ppb | Within Limit |
Recommended Water Filters
The most effective treatment for arsenic removal is Reverse Osmosis.
| Filter Type | Effectiveness | NSF Standard | Notes |
|---|---|---|---|
| Reverse Osmosis (RO) | 95-99% | NSF 58 | Most effective for both arsenate (As V) and arsenite (As III) |
| Adsorptive Media (iron-based) | 90-95% | NSF 53 | Effective for arsenate; may need pre-oxidation for arsenite |
| Distillation | 98%+ | NSF 62 | Very effective but impractical for large volumes |