Is Dublin, CA Tap Water Safe to Drink?
Graded A with no contaminants above EPA limits. Here's everything we tested and how Dublin ranks. What to do next ↓
94.7/100
waterverge.com Dublin, CA — Water Quality Report
Dublin's drinking water received a grade of A (94.7 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 2,753 residents using groundwater.
Lead levels were measured at 4.8 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 7 violations on record, including 0 health-based violations. All violations have been resolved.
What to know about Dublin's water
Dublin ranks #44 out of 694 cities in California for water quality, placing it one of the best in the state.
Dublin relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Dublin may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Dublin, CA water safe to drink?
Based on EPA testing data, Dublin's tap water is generally safe to drink. The water system earned a grade of A (94.7/100), meeting federal drinking water standards across key contaminant categories. The city's 1 water system serves approximately 2,753 residents using groundwater (wells).
Recent water quality updates for Dublin
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Dublin's water quality assessment. Grade: A (94.7/100).
Federal disaster declaration (FEMA DR-4683). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3591). Flood event — may have impacted local water infrastructure.
Contaminants: Nitrate.
Contaminants: TTHM, Total Haloacetic Acids (HAA5).
Contaminants: Chlorine.
Key contaminant findings
Based on the most recent EPA sampling data for Dublin's water supply.
Well within EPA limits.
Violation history
Dublin's water system has 7 total violations on record, including 0 health-based violations. All violations have been resolved.
Flood & environmental risk
Alameda County has experienced 9 federally declared disasters since 1970. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Indian C Nr Sunol, San Antonio Reservoir Nr Sunol, San Antonio C Nr Sunol, Alameda C A Sunol Water Temple A Sunol, Alamo Cn Nr Pleasanton.
Where does Dublin's water come from?
Dublin's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 2,753 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Indian C Nr Sunol (river), San Antonio Reservoir Nr Sunol (lake), San Antonio C Nr Sunol (river), Alameda C A Sunol Water Temple A Sunol (river), Alamo Cn Nr Pleasanton (stream).
What Dublin residents can do
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Dublin's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Dublin
Industrial polluters nearby
Reported releases to surface water by facilities near Dublin, ranked by pounds discharged annually.
Total reported releases to surface water: 0 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
OLDCASTLE PRECAST INC PLEASANTON, CA94566 | Lead compounds | 0 | 3.4 mi |
MISSION VALLEY ROCK SUNOL, CA94586 | Mercury compounds | 0 | 10.0 mi |
GILLIG LIVERMORE, CA94551 | — | — | 5.0 mi |
APPLIED BIOSYSTEMS LLC PLEASANTON, CA94566 | — | — | 5.0 mi |
CEMEX PLEASANTON READY-MIX PLEASANTON, CA94566 | — | — | 4.7 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Alameda County has experienced 9 federally declared disasters since 1970. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 4.8 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Dublin compares by contaminant
Explore where Dublin ranks among all California cities for specific contaminants.
Water source & infrastructure
Where Dublin's water comes from
Dublin's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by federal ownership and serves approximately 2,753 people through 1 water system.
Water bodies near Dublin
Dublin is located near 5 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Dublin
| System Name | PWSID | Population | Source |
|---|---|---|---|
| FORT HUNTER LIGGETT | CA2710702 | 2,753 | GW |
How Dublin compares
Full California rankings →Dublin's score of 94.7/100 is above the average of 57/100 among major California cities. It outscores 10 of 10 nearby cities.
Nearby cities
View California rankings →About Dublin, CA
Learn more about your water
Guides and resources related to Dublin's water quality findings.
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Frequently asked questions
Is Dublin, CA tap water safe to drink?
Dublin's water quality earned a grade of A (94.7/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #44 out of 694 cities tested in California.
What contaminants are in Dublin's water?
Lead was measured at 4.8 ppb (90th percentile). 7 violations are on record.
How is Dublin's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Dublin?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Dublin's water come from?
Dublin's water is sourced from Groundwater. The city has 1 water system serving approximately 2,753 residents.
Is Dublin's groundwater at risk of contamination?
Dublin uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 7 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Dublin's water compare to other cities?
Dublin ranks #44 out of 694 cities in California (better than 94% of state cities) and #439 out of 15744 cities nationally (97th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Dublin's small water system affect quality?
Dublin's system serves approximately 2,753 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 7 violations on record.