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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
South Gate's water meets EPA standards, though 0 contaminant(s) are elevated above 50% of limits.
•All 1 historical violation(s) in South Gate have been resolved.
Generally Safe. South Gate's tap water meets EPA standards. Score: 88/100.
Want to understand your score better? Learn how scores are calculated →
Is your neighbor's water better? See how South Gate's grade of A- (88/100) stacks up.
Guides matched to the contaminants found in your water
10 contaminants tested • EPA SDWIS data • Click any contaminant for details
| Contaminant | Level Detected | EPA Limit | % of Limit | Status |
|---|---|---|---|---|
| Total Trihalomethanes | 14.58 ug/L | 80.00 ug/L | 18.2% | Safe |
| Haloacetic Acids | 10.76 ug/L | 60.00 ug/L | 17.9% | Safe |
| Chromium | 0.015 mg/L | 0.100 mg/L | 14.7% | Safe |
| Fluoride | 0.510 mg/L | 4.00 mg/L | 12.8% | Safe |
| Mercury | 0.0002 mg/L | 0.0020 mg/L | 9.7% | Safe |
| Copper | 0.122 mg/L | 1.30 mg/L | 9.4% | Safe |
| Nitrate | 0.796 mg/L | 10.00 mg/L | 8.0% | Safe |
| Lead | 0.0010 mg/L | 0.015 mg/L | 7.0% | Safe |
| Arsenic | 0.0005 mg/L | 0.010 mg/L | 4.6% | Safe |
| Nitrite | 0.0041 mg/L | 1.00 mg/L | 0.4% | Safe |
Based on detected contaminants in your water
There is no safe level of lead exposure. An NSF 53 certified filter or reverse osmosis system is strongly recommended.
Get APEC RO System (Removes 99% Lead) — ~$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 South Gate's water quality data.
Specific to the contaminants found in South Gate's EPA-reported water data
Lead has been detected in South Gate's water supply. There is no safe level of lead exposure. In children, lead can cause developmental delays, learning difficulties, irritability, weight loss, hearing loss, and seizures. In adults, lead exposure contributes to cardiovascular problems, decreased kidney function, and reproductive issues. Pregnant women exposed to lead can transfer it to their developing fetus, increasing risk of premature birth and reduced growth. Use an NSF 53 certified filter and run cold water before drinking to reduce exposure.
Arsenic has been detected in South Gate'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.
Elevated nitrate levels in South Gate's water pose particular risk to infants under six months. Nitrates can cause methemoglobinemia ("blue baby syndrome"), a condition where the blood cannot carry sufficient oxygen. Symptoms include bluish skin color, shortness of breath, and in severe cases, death. Formula-fed infants are at greatest risk. Pregnant women should also limit nitrate exposure. Boiling water does NOT remove nitrates—it actually concentrates them. Reverse osmosis or distillation systems effectively remove nitrates.
Past violations for South Gate's water system
other
Lead - 2/4/2022
ResolvedHow to contact your water provider and access official reports
The primary water provider for South Gate is SOUTH GATE WATER SYSTEM (Public Water System ID: CA273838), serving approximately 91,287 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.
South Gate 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 Lead Removal
APEC Reverse Osmosis System
Multi-stage RO reduces 99%+ of lead — the EPA-recommended treatment for lead.
Check Price on AmazonLower-cost alternative
ZeroWater 5-Stage Pitcher
NSF 53 certified pitcher · ~$40
No-install option — NSF 53 certified for lead & chromium reduction.
Check Price on Amazon →Not 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 South Gate water quality needs:
Understand the contaminants that may be present in South Gate's water supply and their health effects.
Matched to the contaminants actually detected in South Gate's water
Lead was detected in South Gate's water — an NSF 53 certified filter or reverse osmosis system removes up to 99% of 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.
South Gate's 88/100 score measured against the California average and the national benchmark
South Gate has no contaminants above EPA limits today, though its 1 recorded compliance event is the main reason its grade is A- rather than higher.
Compared with the California average of 80, South Gate scores 8 points above the state average. Among the 193 California cities we track, South Gate ranks #38 — in the top third of the state.
Against the national benchmark of 80.8/100, South Gate comes in 7.2 points above the national average. The contaminant closest to its limit here is Total Trihalomethanes, measured at 18.2% of the EPA limit, comfortably within the safe range. At the other end, Nitrite is its cleanest reading at just 0.4% of the limit.
For South Gate 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.
South Gate's drinking water is managed by SOUTH GATE WATER SYSTEM, which serves approximately 91,287 residents through a combination of surface and groundwater sources. Our analysis of 10 tested contaminants reveals a quality score of 88/100, placing South Gate above average compared to other California cities.
South Gate'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.
South Gate's water system has 1 documented EPA violation 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 South Gate, California residents about their drinking water
Yes, South Gate's tap water generally meets EPA safety standards with a quality score of 88/100 (Grade A-). All 10 tested contaminants are within legal limits, indicating the water treatment process is effective. However, water quality at your faucet can differ from what leaves the treatment plant due to your home's plumbing. Older homes built before 1986 may have lead solder or galvanized pipes that introduce contaminants. Even with a good score, a basic water filter can improve taste and provide extra peace of mind.
South Gate's water has been tested for 10 contaminants spanning inorganic chemicals, disinfection byproducts, organic compounds, radionuclides, and microorganisms. All tested contaminants are within safe limits, with 10 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.
South Gate has a water quality score of 88/100, earning a grade of A-. 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. South Gate's score of 88 is 16 points above the national average, indicating excellent water quality management. Learn more about how scores are calculated.
Based on South Gate's water quality profile, we recommend a reverse osmosis (RO) system for the most comprehensive filtration. Lead has been detected, and RO systems remove over 99% of lead. 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.
South Gate's primary water system, SOUTH GATE WATER SYSTEM (PWS ID: CA273838), 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 91,287 residents.
Yes, lead has been detected in South Gate's water supply. The EPA has established that there is no safe level of lead exposure, making this a priority concern especially for households with children or pregnant women. Lead typically enters drinking water through corrosion of lead service lines and lead solder in household plumbing, particularly in homes built before 1986. To reduce exposure: always use cold water for drinking and cooking, flush the tap for 30 seconds to 2 minutes after periods of non-use, and install an NSF 53 certified filter. Consider having your water independently tested at the tap, as lead levels can vary significantly from house to house depending on plumbing age and condition.
Yes, South Gate's water system has 1 documented EPA violation 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 South Gate. 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 SOUTH GATE 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.