Is Green Valley, CA Tap Water Safe to Drink?
Graded B+, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
84.1/100
waterverge.com Green Valley, CA — Water Quality Report
Green Valley's drinking water received a grade of B+ (84.1 out of 100), indicating good water quality. The city's 1 water system serves approximately 1,275 residents using groundwater.
Lead levels were measured at 0.0 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 4 violations on record, including 3 health-based violations. 2 remain unresolved.
What to know about Green Valley's water
Green Valley ranks #290 out of 694 cities in California for water quality, placing it mid-range in the state.
Green Valley 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, Green Valley may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Green Valley, CA water safe to drink?
Green Valley's tap water meets most EPA standards but has areas that warrant attention. With a grade of B+ (84.1/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 1,275 residents using groundwater (wells).
Recent water quality updates for Green Valley
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Green Valley's water quality assessment. Grade: B+ (84.1/100).
1 health-based. Contaminants: LEAD AND COPPER RULE REVISIONS.
Federal disaster declaration (FEMA DR-3592). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4683). Flood event — may have impacted local water infrastructure.
1 health-based. Contaminants: Nitrate.
1 health-based. Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Green Valley's water supply.
Well within EPA limits.
Violation history
Green Valley's water system has 4 total violations on record, including 3 health-based violations. 2 remain unresolved. 2 violations were issued in the last 5 years.
Flood & environmental risk
Los Angeles County has experienced 10 federally declared disasters since 1980. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Green Valley's water come from?
Green Valley's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,275 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Green Valley 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.
Green Valley'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
Flood & disaster history
Los Angeles County has experienced 10 federally declared disasters since 1980. 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. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Green Valley compares by contaminant
Explore where Green Valley ranks among all California cities for specific contaminants.
Water source & infrastructure
Where Green Valley's water comes from
Green Valley'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 local government ownership and serves approximately 1,275 people through 1 water system.
Water systems serving Green Valley
| System Name | PWSID | Population | Source |
|---|---|---|---|
| GREEN VALLEY CWD | CA1910244 | 1,275 | GW |
How Green Valley compares
Full California rankings →Green Valley's score of 84.1/100 is above the average of 57/100 among major California cities. It outscores 8 of 10 nearby cities.
Nearby cities
View California rankings →About Green Valley, CA
Learn more about your water
Guides and resources related to Green Valley's water quality findings.
Explore water quality across Los Angeles
Frequently asked questions
Is Green Valley, CA tap water safe to drink?
Green Valley's water quality earned a grade of B+ (84.1/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #290 out of 694 cities tested in California.
What contaminants are in Green Valley's water?
Lead was measured at 0.0 ppb (90th percentile). 4 violations are on record.
How is Green Valley'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 Green Valley?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Green Valley's water come from?
Green Valley's water is sourced from Groundwater. The city has 1 water system serving approximately 1,275 residents.
What health violations has Green Valley's water system had?
Green Valley has 3 health-based violations on record. The most recent violation was recorded in October 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
Is Green Valley's groundwater at risk of contamination?
Green Valley 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 4 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 Green Valley's water compare to other cities?
Green Valley ranks #290 out of 694 cities in California (better than 58% of state cities) and #6096 out of 15744 cities nationally (61th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Green Valley's small water system affect quality?
Green Valley's system serves approximately 1,275 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 4 violations on record.