Pasadena’s tap water is officially safe to drink. Pasadena Water & Power (PWP) and the California State Water Resources Control Board (CA SWRCB) confirm the entire PWP service area meets all EPA and state drinking water standards, with no active violations as of 2025 monitoring. The Do-Not-Drink notice issued after the January 2025 Eaton Fire has been lifted.
“Meets legal limits” and “zero risk” are not the same. Some contaminants in Pasadena’s water test below regulatory maximums but above California’s stricter public health goals (PHGs). This article reviews the numbers, what to monitor, and potential actions.
Quick Answer: Is Pasadena Tap Water Safe Right Now?
Yes. As of the latest official reporting, Pasadena tap water is safe to drink. The Eaton Fire Do-Not-Drink notice issued in January 2025 has been lifted following testing and repairs across fire-impacted zones.
- Safe for drinking and cooking today? Yes, per PWP and CA SWRCB.
- Any active advisories or boil notices? No active notices as of the latest update.
- Biggest watch-outs even when water meets legal limits? Arsenic, chromium-6, and disinfection byproducts (DBPs) are detected below MCLs but above stricter health goals, relevant for long-term, daily exposure.
What the Latest Official Reports Actually Say
PWP’s 2026 Consumer Confidence Report (CCR), covering 2025 monitoring data, confirms zero MCL violations. Water meets or exceeds all EPA and California standards. PWP tests for over 170 elements from approximately 300 locations daily.
The concern is the gap between what’s legal and what’s considered lowest risk by health scientists.
| Standard Type | What It Is | Arsenic Example |
|---|---|---|
| MCL (legal limit) | Maximum allowed in tap water | 10 ppb |
| PHG (health goal) | California’s science-based target, not legally binding | 0.004 ppb |
That gap is real. Arsenic in Pasadena water is below 10 ppb (legal), but California’s health goal is 0.004 ppb. Meeting the law does not mean matching the health goal.
Latest Test Results Snapshot (Most Important Numbers)
| Contaminant | Latest Level/Range | Legal Limit (MCL/Action Level) | Health Goal (PHG/MCLG) | What It Means for You |
|---|---|---|---|---|
| Lead | ND – 3.4 ppb (90th percentile) | 15 ppb (action level) | 0 ppb | Well below action level; risk mostly from home pipes, not source water |
| Total Trihalomethanes (TTHMs) | 3 – 74 ppb; highest LRAA 52 ppb | 80 ppb | Lower than MCL | Legal, but long-term exposure can be a factor; shower inhalation adds exposure |
| HAA5 | ND – 25 ppb; highest LRAA 22 ppb | 60 ppb | Lower than MCL | Comfortably within legal range |
| Arsenic | Below 10 ppb | 10 ppb | 0.004 ppb | Legal but PHG is 2,500x lower than the MCL |
| Chromium-6 | Below 10 ppb (CA MCL) | 10 ppb (CA, effective Oct 2024) | 0.02 ppb | Detected; meets law, exceeds health goal |
| PFAS (PFOA/PFOS) | Non-detect in treated water | 4 ng/L (EPA MCL) | , | No detections through 2025 |
Bottom line: Pasadena water is in full legal compliance. But for contaminants like arsenic and chromium-6, the legal limit and the health goal are far apart. If you are healthy and drink tap water occasionally, it is likely fine. If you drink it daily for years, especially with a health condition or during pregnancy, those gaps may matter.
Recent Do-Not-Drink or Emergency Notices
Timeline:
- January 2025: Eaton Fire prompts PWP to issue a Do-Not-Drink notice for affected zones.
- During notice: Residents were told not to drink or cook with tap water.
- Testing and pipe repairs were conducted across fire-impacted areas.
- Notice lifted: PWP and CA SWRCB confirmed safe water status restored across the entire service area.
- Ongoing: Monitoring results are available online and in the annual CCR.
Important reminder from the past notice: During a Do-Not-Drink order, boiling, freezing, filtering, or adding disinfectants to tap water will not make it safe. This was PWP’s explicit guidance.
If an official Do-Not-Drink notice returns:
- Do not drink tap water, even if it looks and smells normal.
- Do not cook with tap water or use it to make ice.
- Use bottled or alternative water until the official notice is lifted by PWP or CA SWRCB.
For general emergency water-safety and preparedness guidance, see the Red Cross’s water safety advice for emergencies: https://www.redcross.org/get-help/how-to-prepare-for-emergencies/types-of-emergencies/water-safety.html.
Where Pasadena Water Comes From
Pasadena’s water is a blend of two main sources:
- Local groundwater (Raymond Groundwater Basin): 24–40% of supply, pumped from 9–10 active wells in Pasadena and Monk Hill. The Raymond Groundwater Basin has known high levels of nitrates due to various human-influenced sources, including agriculture, septic systems, and landscape fertilization. Trichloroethylene (TCE) is also associated with this basin.
- Imported surface water (MWD): 60–76% of supply, via Metropolitan Water District’s Weymouth Filtration Plant, blended from the Colorado River and Northern California’s State Water Project.
- Neighboring agencies: Possible occasional sourcing, but not used in recent years (last noted in 2021).
| Source | Common Concerns |
|---|---|
| Local groundwater (Raymond Basin) | Nitrates, VOCs (PCE/TCE), perchlorate, 1,2,3-TCP from nearby industrial contamination |
| Imported surface water (MWD) | Different mineral profile, disinfection byproduct formation, seasonal variation |
The groundwater percentage matters because groundwater in the Raymond Basin has known contamination from gas stations, repair shops, and underground storage tanks, all treated before it reaches your tap.
How Pasadena Water Is Treated
- Pump groundwater from active wells in the Raymond Basin and route it to treatment facilities.
- Remove VOCs, perchlorate, and organic contaminants using Granular Activated Carbon (GAC), six 22-foot GAC vessels at facilities like Wadsworth and Monk Hill, operated in a lead-lag arrangement.
- GAC Efficiency: GAC effectively removes various contaminants. For perchlorate, GAC enhanced with cetylpyridinium chloride (CPC) has been shown to remove it below regulatory standards, with high efficiency for approximately 15,000 bed volumes over 4-5 months. GAC is also effective for volatile organic compounds, with improved removal when water is pre-filtered.
- Disinfect with sodium hypochlorite after GAC treatment to control microbial contamination.
- Store in reservoirs (Sheldon, Thomas) and distribute through mains to homes.
What Pasadena uses vs. doesn’t use:
- ✅ Uses: GAC filtration, sodium hypochlorite disinfection, pre-treatment for perchlorate/VOCs.
- ❌ Doesn’t use (per available data): Ion exchange or reverse osmosis for citywide treatment.
PFAS (“Forever Chemicals”) in Pasadena: What the Data Shows
PFAS are a concern in many California water systems. In Pasadena, the data is consistently clean.
PWP has conducted annual PFAS monitoring since 2020. Through 2025, all results came back as non-detect in treated drinking water. The EPA’s MCL for PFOA and PFOS is 4 ng/L. Pasadena has not come close.
What “non-detect” actually means:
- The testing equipment did not find PFAS above the method’s detection threshold. It does not guarantee absolute zero.
- Detection limits for PFAS tests are very low (parts per trillion), so non-detect is a genuinely good result.
- It means Pasadena’s GAC treatment is doing its job. GAC effectively removes long-chain PFAS like PFOS and PFOA.
This is one area where Pasadena’s water holds up well against the broader California analysis.
Lead in Pasadena Tap Water: What the Results Mean for Your Home
The latest 90th percentile lead result from residential taps is ND – 3.4 ppb, well below the EPA action level of 15 ppb. The health goal (MCLG) is 0 ppb. There is no truly safe threshold for lead, but at these detected levels, risk is low for most people.
Here’s the key point: lead does not usually come from Pasadena’s source water. It comes from aging pipes, solder, and fixtures inside homes and buildings.
If your home is older (pre-1986 plumbing):
- Run cold water for 30–60 seconds before drinking, especially if water has been sitting in pipes overnight or for several hours.
- Use an NSF/ANSI 53 or NSF/ANSI 58 certified filter specifically rated to reduce lead if you want an extra layer of protection.
- Consider getting your tap tested.
- Residents can use commercial laboratories, but PWP does not provide free lead testing or a list of approved labs. PWP suggests contacting the CA SWRCB Division of Drinking Water for a list of qualified laboratories.
- Cost: A simple lead test typically costs $30-$50. A full panel can exceed $1,000.
- Testing Protocol (General EPA Guidelines):
- Contact the chosen lab for instructions, containers, costs, and turnaround time.
- Allow water to sit undisturbed in the pipes for at least 6 hours for a first-draw sample.
- Fill the lab-provided bottle directly from the cold tap, without flushing the water first.
- Mail the sample within 48 hours.
- Expect results in approximately 4 weeks.
- Recommended Labs: California-accredited laboratories, many of which are EPA NLLAP-accredited for drinking water, include EMSL San Leandro, Envirocheck Burbank/Orange, Eurofins (Tustin/Pomona/San Diego), LA Testing Huntington Beach, and CLS Labs.
- PWP confirms no lead service lines citywide and complies with the Lead and Copper Rule through regular tap testing in over 50 homes every three years.
Disinfection Byproducts (TTHMs/HAA5): Why They Show Up and Who Should Care More
Disinfection byproducts (DBPs) form when chlorine reacts with natural organic matter in water. They are an unavoidable outcome of disinfection. The alternative (untreated microbial contamination) is far more dangerous.
In Pasadena’s water:
- TTHMs: 3–74 ppb range; highest LRAA 52 ppb vs. MCL of 80 ppb ✅
- HAA5: ND–25 ppb range; highest LRAA 22 ppb vs. MCL of 60 ppb ✅
Both are within legal limits. However, long-term daily exposure to DBPs has been linked to bladder and colorectal cancer risk in some studies. Exposure to DBPs at levels below MCLs but above PHGs is associated with cancers (bladder, liver, colon), reproductive and developmental problems, cardiovascular issues, respiratory illnesses, and immune suppression. Many DBPs are cytotoxic, genotoxic, and mutagenic even at very low levels.
One thing most people miss: long hot showers increase inhalation exposure to volatile DBPs like chloroform that off-gas from hot water. There are no specific guidelines from PWP or CA SWRCB regarding acceptable shower duration and frequency to minimize DBP inhalation exposure for pregnant individuals, infants, or those with thyroid conditions.
People who may want to be extra cautious:
- Pregnant people , DBPs have been associated with low birth weight and pregnancy complications in some research.
- Infants and young children , higher sensitivity to chemical exposure per body weight.
- Anyone with thyroid concerns , chlorate, a byproduct of chlorine disinfection, can interfere with thyroid function.
Arsenic and Chromium-6: The “It’s Legal But Still Concerning” Issue
This is where the MCL vs. PHG gap is most visible.
- Arsenic: Detected in Pasadena’s finished water below the EPA MCL of 10 ppb, but California’s PHG is 0.004 ppb. That is a 2,500x difference. Long-term arsenic exposure at levels below MCLs but above PHGs has been linked to skin lesions, cancers (skin, lung, bladder), cardiovascular disease, fetal loss, reduced birth weight, infant mortality, early-life lung cancer, bronchiectasis, and COPD. Individuals with compromised methylation pathways may experience worse outcomes.
- Chromium-6: Detected below California’s MCL of 10 ppb (effective October 2024), but the PHG is 0.02 ppb. California’s own science says there is no fully safe threshold; cancer risk begins at very low levels. While specific data at low levels is limited, general links to cancer (lung, gastrointestinal) have been made. Chromium-6 can also disrupt thyroid function and poses risks during pregnancy and to children.
Meeting the legal limit is not the same as meeting the lowest-risk threshold. PWP is compliant. The health science just sets the bar lower than the law does.
What you can do:
- Check your specific zone’s results in PWP’s annual CCR. Levels can vary by water source blend in your area.
- Consider an NSF/ANSI 58 certified reverse osmosis system for arsenic reduction, or an NSF/ANSI 53 certified filter specifically rated for chromium-6 reduction. Check the NSF product database for verified options. NSF/ANSI 58 certified RO systems can significantly remove arsenic and total chromium.
- Talk to your doctor if you are pregnant, managing a chronic condition, or consuming large amounts of tap water daily and feel uncertain about your exposure.
Other Contaminants People Search For
- Perchlorate: Present in raw groundwater; treated at Monk Hill Treatment Facility before it reaches your tap. GAC, when enhanced with cetylpyridinium chloride (CPC) tailoring, successfully removed perchlorate to below regulatory standards.
- VOCs (PCE/TCE): Found in raw groundwater from industrial contamination nearby; removed effectively with GAC treatment. GAC is effective in removing volatile organic compounds.
- 1,2,3-TCP: Trace levels detected in groundwater; treated and monitored; classified as a probable human carcinogen.
- Nitrates: Common groundwater concern; monitored regularly by PWP; reported below MCL in finished water. The Raymond Groundwater Basin shows documented high levels of nitrates.
How to Read Pasadena’s Consumer Confidence Report (CCR)
The CCR can appear intimidating. It is straightforward once you know what to look for.
- Find your water source and the monitoring period. The CCR published in 2026 covers 2025 monitoring data; do not confuse the publication year with the reporting year.
- Look for the “highest LRAA” (Locational Running Annual Average) for TTHMs and HAA5. This is the number that counts for compliance, not just the single highest reading.
- Compare three columns: detected level, MCL (violation threshold), and PHG/MCLG (health goal). They tell different stories.
- Watch your units. ppb (micrograms per liter) and ng/L (nanograms per liter) are not the same; mixing them up by 1,000x is an easy mistake.
Two numbers that matter most in the CCR:
- Highest LRAA , for TTHM and HAA5 compliance.
- 90th percentile lead result , for lead compliance at the tap.
Should You Filter Pasadena Tap Water? Pick Based on Your Goal
| Concern | Filter Type | NSF Standard to Look For | Tradeoffs |
|---|---|---|---|
| Taste/odor (chlorine) | Pitcher or faucet carbon filter | NSF/ANSI 42 | Low cost; needs regular cartridge changes |
| Reduce lead | Under-sink carbon or RO | NSF/ANSI 53 (carbon) or 58 (RO) | RO wastes some water; carbon needs certification for lead |
| Reduce DBPs (TTHMs/HAA5) | Carbon block filter | NSF/ANSI 53 | Effective for many DBPs; maintain per schedule |
| Reduce arsenic/chromium-6 | Reverse osmosis system | NSF/ANSI 58 | Most effective; initial cost $200-$700, some water waste, requires maintenance |
No filter fixes everything, and a poorly maintained filter can make things worse. Change filters on schedule, every time, without exception.
Bottled Water vs. Tap in Pasadena: When It Makes Sense
Bottled water isn’t automatically cleaner than Pasadena tap water. In most normal situations, tap water is a reasonable choice.
Times bottled water makes sense:
- During an active Do-Not-Drink notice (this is the clearest case).
- If you are immunocompromised and your doctor specifically recommends it.
- During a temporary pipe issue or repair affecting your building.
Downsides of defaulting to bottled water:
- Costs significantly more long-term.
- Environmental waste from plastic.
- Bottled water is regulated differently than tap water and is not always tested more rigorously.
If you choose bottled water, check the brand’s website or label for the water source and test results. Some brands are just repackaged municipal water.
Taste, Smell, Cloudy Water: What’s Normal vs. When to Call
- Chlorine smell: Normal, especially after flushing or routine disinfection. Run cold water for a minute and it dissipates.
- Milky or cloudy water: Trapped air bubbles; fill a glass and watch. If it clears bottom-up within 60 seconds, it is just air.
- Brown or discolored water: Usually sediment from pipe disturbance or nearby maintenance; do not run laundry; call PWP if it lasts more than a few minutes.
- Sudden chemical or solvent smell: Stop using the water for drinking immediately and call PWP. This warrants a call, not a wait-and-see.
FAQs
Is Pasadena tap water safe to drink straight from the tap?
Yes, per all current official reporting. PWP meets all EPA and California MCLs with no active violations. If you have specific health concerns or want lower exposure to contaminants that exceed PHGs (like arsenic or chromium-6), a certified filter is a reasonable addition.
Is Pasadena tap water safe for baby formula?
Legally, yes. Practically, many pediatricians recommend using filtered or boiled water for infant formula as an extra precaution, especially given that lead’s MCLG is zero and infants are more sensitive to chemical exposure. An NSF/ANSI 53 or 58 certified filter rated for lead is a reasonable step.
Is tap water safe during pregnancy?
Pasadena water meets all legal standards. However, pregnant people are considered more sensitive to DBPs, arsenic, chromium-6, and chlorate. If you are pregnant and drinking tap water daily, it is worth talking to your OB or midwife and considering a certified filter targeting those specific contaminants.
Does boiling Pasadena water make it safer?
For most everyday contaminants, no, it does not help and can actually concentrate things like arsenic. Boiling does kill bacteria and viruses. During a Do-Not-Drink notice (like the Eaton Fire situation), PWP explicitly stated that boiling would not make water safe. Follow official guidance only.
What’s the best filter for Pasadena water?
It depends on your concern. For chlorine taste: NSF/ANSI 42 pitcher filter. For lead: NSF/ANSI 53 certified carbon or NSF/ANSI 58 RO. For arsenic and chromium-6: NSF/ANSI 58 reverse osmosis is the strongest option, with initial costs for under-sink units ranging from $200-$700 and maintenance including filter replacement every 6-12 months and membrane replacement every 1-3 years. Check the NSF product database to verify any filter’s certified claims before buying.
Why does the CCR say “no violations” but health goals are exceeded?
Because MCLs (the legal limits) and PHGs (the health goals) are set by different processes. MCLs balance health science with treatment feasibility and cost. PHGs are set purely on health science with no economic consideration. You can be fully compliant with the law while still exceeding the stricter health-based targets.
How often does Pasadena test the water?
PWP tests daily for over 170 elements from approximately 300 locations across the distribution system. Results feed into the annual CCR and are available publicly through PWP’s website.
Where can I check current advisories fast?
Go directly to Pasadena Water & Power’s website or the California State Water Resources Control Board’s drinking water page for the most current advisory status. The U.S. EPA also provides general Safe Drinking Water information and resources here: https://www.epa.gov/ground-water-and-drinking-water/safe-drinking-water-information.
What city in California has the cleanest tap water?
There is no single definitive answer, as water quality varies by system, source, and year. Cities with consistently strong compliance records and low contaminant detection include some smaller municipalities with high-quality groundwater sources. The CA SWRCB’s annual data is the best place to compare systems directly.
Is the tap water in LA safe to drink now?
Los Angeles tap water generally meets all federal and state standards. Like Pasadena, LA’s water may contain contaminants that meet MCLs but exceed PHGs, particularly for DBPs and arsenic. Check the LA Department of Water and Power’s current CCR for the most up-to-date numbers.
How does Pasadena purify water?
Pasadena treats groundwater through Granular Activated Carbon (GAC) filtration to remove VOCs, perchlorate, and organics, followed by sodium hypochlorite disinfection to control microbial contamination. Imported surface water from MWD arrives pre-treated from the Weymouth Filtration Plant. Treated water is stored in reservoirs and distributed through the city’s pipe system.
Key Takeaways
- Current status: Pasadena tap water is safe to drink; no active advisories; Do-Not-Drink notice from Eaton Fire has been lifted.
- “Meets standards” ≠ “lowest possible risk”: Arsenic, chromium-6, and DBPs are legal but exceed stricter PHGs, relevant for long-term daily exposure.
- Read the CCR right: Focus on the highest LRAA (for TTHMs/HAA5) and 90th percentile lead result. Those are the numbers that matter most.
- Filter if you have a specific concern: Match the filter type and NSF certification to the actual contaminant you want to reduce; maintain it properly.
- During any future Do-Not-Drink notice: Do not drink, do not cook with tap water, use an alternative source, and wait for the official all-clear before resuming.
Sources: Pasadena Water & Power CCR and advisories, California State Water Resources Control Board, U.S. EPA MCLs and PFAS rules, Metropolitan Water District / Weymouth Filtration Plant.
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