Drinking water quality · 2024
· Verified
What's in Santa Clarita, CA tap water
30 contaminants were measured in the Santa Clarita, CA water system's 2024 annual report. Each is shown below against its federal limit — 2 sit at or above that limit.
- Reporting year
- 2024
- Contaminants measured
- 30
- Over federal limit
- 2
- Approaching the limit
- 1
- Worst contaminant
- Lithium
- Service area
- CA
5.1× the limit
state-level CCR
At or above the federal limit
Approaching the limit (≥ 80%)
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in Santa Clarita, CA
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
Lithium
● Detected (no federal limit)Measured 11 mg/LSample year 2025Samples 1 detect / 15
below national p90 (76.59999999999991 mg/L across detecting U.S. systems)
PWSID CA4310012 · Source: EPA UCMR5. Limits per EPA's April 2024 PFAS National Primary Drinking Water Regulation. PFAS values reported in nanograms per liter (ng/L) — note that 1 ng/L = 1 part per trillion.
Where your water comes from · EPA SDWIS
Santa Clarita, CA's drinking water comes from ground water, drawn from 21 sources.
Source
21ground water
- WELL · 13
- WELL 13-02
- WELL 22-02
- WELL 18-02
- + 5 more
Treatment
0treatment plants
Distribution
0storage units
Also buys water from SANTA CLARA VALLEY WATER DISTRICT, SAN FRANCISCO REGIONAL WATER SYSTEM.
Source: EPA SDWIS facilities inventory. Methodology.
Historical readings · EPA Six-Year Review (2012–2019)
1 contaminant historically over EPA limits in Santa Clarita, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
TTHM worst: 2016 | 0.089 mg/L 1.1× | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2018 | 0.056 mg/L 93% | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE worst: 2014 | 6.55 mg/L within | 10 mg/L | '12'13'14'15'16'17'18'19 |
NITRATE NITRITE worst: 2016 | 6.1 mg/L within | 10 mg/L | '15'16'17'18'19 |
ARSENIC worst: 2014 | 0.0048 mg/L within below national p90 | 0.01 mg/L | '14'17'18 |
BARIUM worst: 2013 | 0.21 mg/L within near national p90 | 2 mg/L | '12'13'14'15'16'17'18'19 |
FLUORIDE worst: 2017 | 0.19 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
DBAA worst: 2012 | 0.0066 mg/L | — | '12'13'14'15'16'17'18'19 |
DCAA worst: 2012 | 0.017 mg/L | — | '12'13'14'15'16'17'18'19 |
TCAA worst: 2012 | 0.021 mg/L | — | '12'13'14'15'16'17'18'19 |
MBAA worst: 2012 | 0.0018 mg/L | — | '12'13'14'16'19 |
MCAA worst: 2017 | 0.002 mg/L | — | '17'18'19 |
BROMODICHLOROMETHANE worst: 2012 | 0.02 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMOFORM worst: 2012 | 0.014 mg/L | — | '12'13'14'15'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.064 mg/L | — | '12'13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.027 mg/L | — | '12'13'14'15'16'17'18'19 |
PWSID CA4310012 · Source: EPA Six-Year Review 4 (2012–2019). Values are the highest detection in each calendar year; non-detect years are omitted. Year tags above show every year with a detection.
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 0.0065 ug/LAverageLos Angeles County Waterworks District #36 | 0.0065 ug/LNL | At or above the limit |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 0.0045 ug/LAverageLos Angeles County Waterworks District #36 | 0.0051 ug/LNL | Approaching the limit |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid, a chlorinated PFAS compound. | Not detected ug/LMaximumLos Angeles County Waterworks District #36 | 0.005 ug/LMCL | None detected |
+By source (2)— Los Angeles County Waterworks District #36, Santa Clarita Valley Water Agency
| |||
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)ADONA, a newer-generation PFAS replacement compound. | Not detected ug/LAverageSanta Clarita Valley Water Agency | 0.003 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| 4:2 Fluorotelomer sulfonic acid (4:2 FTS)4:2 fluorotelomer sulfonic acid, a PFAS-related compound. | Not detected ug/LMaximumLos Angeles County Waterworks District #36 | 0.003 ug/LMCL | None detected |
+By source (2)— Los Angeles County Waterworks District #36, Santa Clarita Valley Water Agency
| |||
| 6:2 Fluorotelomer sulfonic acid (6:2 FTS)6:2 fluorotelomer sulfonic acid, a PFAS-related compound. | Not detected ug/LMinimumSanta Clarita Valley Water Agency | 0.005 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| 8:2 Fluorotelomer sulfonic acid (8:2 FTS)8:2 fluorotelomer sulfonic acid, a PFAS-related compound. | Not detected ug/LAverageSanta Clarita Valley Water Agency | 0.005 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid, a chlorinated PFAS compound. | Not detected ug/LAverageSanta Clarita Valley Water Agency | 0.002 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound. | Not detected ug/LMinimumSanta Clarita Valley Water Agency | 0.005 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)N-ethyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound. | Not detected ug/LAverageSanta Clarita Valley Water Agency | 0.005 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)N-methyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound. | Not detected ug/LMinimumSanta Clarita Valley Water Agency | 0.006 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Nonafluoro-3,6-dioxaheptanoic acidNonafluoro-3,6-dioxaheptanoic acid, a PFAS-related compound. | Not detected ug/LAverageSanta Clarita Valley Water Agency | 0.02 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluoro-3-methoxypropanoic acid (PFMPA)Perfluoro-3-methoxypropanoic acid, a PFAS-related compound. | Not detected ug/LMinimumSanta Clarita Valley Water Agency | 0.004 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluoro-4-methoxybutanoic acid (PFMBA)Perfluoro-4-methoxybutanoic acid, a PFAS-related compound. | Not detected ug/LMaximumSanta Clarita Valley Water Agency | 0.003 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)Perfluoro(2-ethoxyethane)sulfonic acid, a PFAS-related compound. | Not detected ug/LMaximumSanta Clarita Valley Water Agency | 0.003 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | Not detected ug/LAverageSanta Clarita Valley Water Agency | 0.5 ug/LNL | Within the limit |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluorodecanoic acid (PFDA)Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected ug/LMaximumSanta Clarita Valley Water Agency | 0.003 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluorododecanoic acid (PFDoA)Perfluorododecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected ug/LAverageSanta Clarita Valley Water Agency | 0.003 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluoroheptanesulfonic acid (PFHpS)Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.' | Not detected ug/LMaximumSanta Clarita Valley Water Agency | 0.003 ug/LMCL | None detected |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | Not detected ug/LAverageSanta Clarita Valley Water Agency | 0.003 ug/LMCL | Within the limit |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | Not detected ug/LAverageSanta Clarita Valley Water Agency | 0.003 ug/LNL | Within the limit |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detected ug/LAverageLos Angeles County Waterworks District #36 | 0.003 ug/LMCL | Within the limit |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.' | Not detected ug/LMaximumLos Angeles County Waterworks District #36 | 0.004 ug/LMCL | None detected |
+By source (2)— Los Angeles County Waterworks District #36, Santa Clarita Valley Water Agency
| |||
| Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.' | Not detected ug/LAverageLos Angeles County Waterworks District #36 | 0.004 ug/LMCL | None detected |
+By source (2)— Los Angeles County Waterworks District #36, Santa Clarita Valley Water Agency
| |||
| Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detected ug/LAverageLos Angeles County Waterworks District #36 | 0.003 ug/LMCL | Within the limit |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
| Perfluorotetradecanoic acid (PFTeDA)Perfluorotetradecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected ug/LMinimumLos Angeles County Waterworks District #36 | 0.008 ug/LMCL | None detected |
+By source (2)— Los Angeles County Waterworks District #36, Santa Clarita Valley Water Agency
| |||
| Perfluorotridecanoic acid (PFTrDA)Perfluorotridecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected ug/LMaximumLos Angeles County Waterworks District #36 | 0.007 ug/LMCL | None detected |
+By source (2)— Los Angeles County Waterworks District #36, Santa Clarita Valley Water Agency
| |||
| Perfluoroundecanoic acid (PFUnA)Perfluoroundecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected ug/LMinimumLos Angeles County Waterworks District #36 | 0.002 ug/LMCL | None detected |
+By source (2)— Los Angeles County Waterworks District #36, Santa Clarita Valley Water Agency
| |||
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detected ug/LAverageSanta Clarita Valley Water Agency | 0.005 ug/LMCL | Within the limit |
+By source (2)— Santa Clarita Valley Water Agency, Los Angeles County Waterworks District #36
| |||
Source: Santa Clarita, CA's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.
People also ask about Santa Clarita, CA's water
+Is Santa Clarita, CA tap water safe to drink in 2024?
The 2024 Consumer Confidence Report for the Santa Clarita, CA water utility lists 2 contaminants at or above the federal limit: Lithium and PFOS. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Santa Clarita, CA tap water?
30 contaminants were measured in Santa Clarita, CA's 2024 Consumer Confidence Report, spanning pfas ("forever chemicals") and metals. 30 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Santa Clarita, CA tap water?
2 contaminants in Santa Clarita, CA's 2024 report sit at or above the federal limit: Lithium (5.1× the limit); PFOS (1.0× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Santa Clarita, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2024 report is Lithium, at 5.1× the federal threshold. It belongs to the metals family of contaminants.
+Are any contaminants in Santa Clarita, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: PFOA. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from Santa Clarita, CA's 2024 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Santa Clarita, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2024 report; a new report will replace it once the utility publishes its next annual update.