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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Comprehensive water safety analysis • Updated June 2026
Arcadia's water quality score of 68/100 falls below average, with 0 contaminants at concerning levels.
•All 4 historical violation(s) in Arcadia have been resolved.
Some Concerns. Consider a water filter for extra protection. Score: 68/100.
Want to understand your score better? Learn how scores are calculated →
Is your neighbor's water better? See how Arcadia's grade of C+ (68/100) stacks up.
Guides matched to the contaminants found in your water
8 contaminants tested • EPA SDWIS data • Click any contaminant for details
| Contaminant | Level Detected | EPA Limit | % of Limit | Status |
|---|---|---|---|---|
| Haloacetic Acids | 25.96 ug/L | 60.00 ug/L | 43.3% | Safe |
| Copper | 0.440 mg/L | 1.30 mg/L | 33.8% | Safe |
| Fluoride | 0.968 mg/L | 4.00 mg/L | 24.2% | Safe |
| Total Trihalomethanes | 19.17 ug/L | 80.00 ug/L | 24.0% | Safe |
| Chromium | 0.021 mg/L | 0.100 mg/L | 21.4% | Safe |
| Nitrite | 0.174 mg/L | 1.00 mg/L | 17.4% | Safe |
| Mercury | 0.0001 mg/L | 0.0020 mg/L | 7.4% | Safe |
| Arsenic | 0.0005 mg/L | 0.010 mg/L | 5.1% | Safe |
Based on EPA data, Arcadia's water quality is below average. A certified water filter can significantly reduce your exposure to harmful contaminants.
See water filters that remove these contaminants →Based on detected contaminants in your water
Best for Arcadia. Removes 95-99% of contaminants including heavy metals, PFAS, and nitrates.
APEC Water Systems RO — ~$200 on AmazonRemoves chlorine, improves taste, and filters many organic compounds. Great starting point.
| Filter Type | Best For | Typical Price |
|---|---|---|
| Reverse Osmosis | Lead, PFAS, arsenic, nitrates (95-99% removal) | $150-300 |
| Under-sink carbon block | Chlorine, VOCs, many organics; some lead/PFAS models | $100-250 |
| Pitcher / faucet carbon | Chlorine, taste; NSF 53 models also reduce lead | $20-50 |
See our full water filter comparison for certified products matched to specific contaminants.
Our data covers your city's water system, but contaminants can vary at the tap. A home water test gives you exact results for your faucet.
Get a Certified Home Water Test — Tap ScoreWe may earn a commission when you purchase through our links, at no extra cost to you. All recommendations are based on our independent analysis of Arcadia's water quality data.
Specific to the contaminants found in Arcadia's EPA-reported water data
Arsenic has been detected in Arcadia's water supply. Long-term arsenic exposure, even at levels near EPA limits, is associated with increased risk of skin, lung, bladder, kidney, and liver cancers. Arsenic exposure can also cause cardiovascular disease, diabetes, and neurological effects. Skin changes like thickening and pigmentation may indicate chronic exposure. Reverse osmosis filtration is highly effective at removing arsenic from drinking water.
Past violations for Arcadia's water system
MCL
Nitrite - 2/4/2023
Resolvedother
Lead - 2/4/2024
Resolvedother
Arsenic - 2/4/2024
Resolvedother
Lead - 2/4/2023
ResolvedHow to contact your water provider and access official reports
The primary water provider for Arcadia is ARCADIA WATER SYSTEM (Public Water System ID: CA117442), serving approximately 53,574 residents. This utility is responsible for treating, testing, and delivering drinking water that meets EPA standards under the Safe Drinking Water Act. As a regulated public water system, it is required to conduct regular testing for over 90 contaminants and publish results in an annual Consumer Confidence Report (CCR) that must be made available to all customers by July 1 each year.
Your water utility is legally obligated to notify customers within 24 hours of any violation that poses an immediate health risk, and within 30 days for less urgent violations. If you are concerned about your water quality, you have the right to request testing data from your utility at any time. For independent verification, you can have your water tested at the tap by a state-certified laboratory. The EPA maintains a list of certified labs by state at epa.gov/dwlabcert. Home testing is particularly important because it captures contamination from your household plumbing that utility testing at distribution points would not detect.
Arcadia Water Quality Score
Based on EPA contaminant data and compliance records
Even with good water quality, a filter removes trace contaminants and improves taste.
Best for Arsenic Removal
APEC Reverse Osmosis System
Multi-stage RO removes arsenic to safe levels — the EPA-recommended treatment for arsenic.
Check Price on AmazonNot sure what filter you need?
Get a lab-certified water test to know exactly what's in your tap water.
Test Your Water with Tap ScoreWe may earn a commission when you purchase through our links, at no extra cost to you.
Based on contaminants detected in your water, these resources may be helpful:
Find the right filter for your Arcadia water quality needs:
Understand the contaminants that may be present in Arcadia's water supply and their health effects.
Matched to the contaminants actually detected in Arcadia's water
Arsenic was detected in Arcadia's water — reverse osmosis is highly effective at removing it.
We may earn a commission when you purchase through our links, at no extra cost to you.
Understand your water better with our in-depth guides on contaminants, filtration, and water safety.
Arcadia's 68/100 score measured against the California average and the national benchmark
Arcadia has no contaminants above EPA limits today, though its 4 recorded compliance events are the main reason its grade is C+ rather than higher.
Compared with the California average of 80, Arcadia scores 12 points below the state average. Among the 193 California cities we track, Arcadia ranks #166 — in the bottom third of the state.
Against the national benchmark of 80.8/100, Arcadia comes in 12.8 points below the national average. The contaminant closest to its limit here is Haloacetic Acids, measured at 43.3% of the EPA limit, comfortably within the safe range. At the other end, Arsenic is its cleanest reading at just 5.1% of the limit.
For Arcadia residents, current contaminant levels are reassuring; the compliance events on record are historical context rather than an active health warning, but they are worth understanding via the EPA databases linked below.
Arcadia's drinking water is managed by ARCADIA WATER SYSTEM, which serves approximately 53,574 residents through a combination of surface and groundwater sources. Our analysis of 8 tested contaminants reveals a quality score of 68/100, placing Arcadia below the state average, suggesting room for improvement.
Arcadia's water quality is strong across all tested parameters, with all contaminants well within EPA safety limits. This reflects effective water treatment and well-maintained infrastructure.
Arcadia's water system has 4 documented EPA violations in its compliance history. All have since been resolved, indicating the utility has addressed past issues. Compliance history is one of the factors in our scoring methodology.
This report is based on data from the EPA Safe Drinking Water Information System (SDWIS) and the EPA Enforcement and Compliance History Online (ECHO) database. Our scoring algorithm weighs contaminant analysis (50%), compliance history (30%), and infrastructure factors (20%). Data is sourced directly from public EPA records and Consumer Confidence Reports. We are an independent resource with no affiliation to water utilities or government agencies. Learn more about our methodology.
Common questions from Arcadia, California residents about their drinking water
Arcadia's tap water has some concerns with a quality score of 68/100 (Grade C+). While all contaminants are technically within EPA limits, 0 are at elevated levels. We recommend using a certified water filter for drinking and cooking water, especially in households with children, pregnant women, or immunocompromised individuals.
Arcadia's water has been tested for 8 contaminants spanning inorganic chemicals, disinfection byproducts, organic compounds, radionuclides, and microorganisms. All tested contaminants are within safe limits, with 8 contaminants well below 50% of their respective EPA Maximum Contaminant Levels.' See the full contaminant breakdown table above for detailed measurements and EPA limit comparisons.
Arcadia has a water quality score of 68/100, earning a grade of C+. This score is calculated using EPA SDWIS data and weighs three factors: contaminant levels (50% of score), regulatory compliance history (30%), and infrastructure factors (20%). The national average is approximately 72/100. Arcadia's score of 68 is 4 points below the national average, suggesting residents should take additional precautions such as using a water filter. Learn more about how scores are calculated.
Based on Arcadia's water quality profile, we recommend a reverse osmosis (RO) system for the most comprehensive filtration. Arsenic is present, and RO systems typically remove over 95% of arsenic. A quality RO system costs approximately $150-300 and is installed under the kitchen sink. Even in cities with good water quality, a filter provides an additional layer of protection against contaminants that may enter water from your home's plumbing. View our water filter comparison guide for specific product recommendations.
Arcadia's primary water system, ARCADIA WATER SYSTEM (PWS ID: CA117442), sources water from a combination of surface and groundwater sources, which provides resilience in the water supply but means the utility must manage treatment for the different contamination profiles of each source type. This system serves approximately 53,574 residents.
Lead testing in Arcadia shows levels within EPA action level guidelines. However, lead contamination is primarily a household plumbing issue rather than a water source issue. Lead can enter water from lead service lines, lead solder (used in homes built before 1986), and brass fixtures. Even if your city's water is lead-free at the treatment plant, your home's plumbing may introduce lead. Homes built before 1986 should consider testing their water at the tap. Running cold water for 30 seconds before drinking is always a good practice.
Yes, Arcadia's water system has 4 documented EPA violations in its compliance history. All violations have been resolved, indicating the utility has taken corrective action. Violations can include exceeding contaminant limits, failure to conduct required testing, or failure to properly notify customers. Water utilities are required by the Safe Drinking Water Act to address violations and notify affected customers. You can look up the full violation history through the EPA's ECHO database or by contacting your water utility directly.
There are several options for testing your water in Arcadia. For the most comprehensive results, use a state-certified laboratory (find one at epa.gov/dwlabcert). Home test kits like Tap Score provide EPA-certified lab analysis with easy-to-understand results. Basic test strips available at hardware stores can screen for common parameters like chlorine, pH, hardness, and lead, though they are less accurate than laboratory testing. You can also request the latest testing data directly from ARCADIA WATER SYSTEM. Testing at your tap is important because it captures contamination from your household plumbing that city-level monitoring at distribution points does not detect.